15 Letter Words Starting with I
There are 308 15-letter English words that start with I, ranging alphabetically from ICHTHYOSAURIANS to IRRITABLENESSES. Top Scrabble® scorers on this list: INEXPLICABILITY (31), INDIVIDUALIZING (30), IMMOBILIZATIONS (30). The list is ordered alphabetically; use the filter box below to jump to a specific starting letter.
Word list
I
- ICHTHYOSAURIANS26 pts
- IDENTICALNESSES18 pts
- IDENTIFICATIONS21 pts
- IDEOGRAPHICALLY27 pts
- IDIOMATICNESSES20 pts
- IGNOMINIOUSNESS18 pts
- ILLEGALIZATIONS25 pts
- ILLIBERALNESSES17 pts
- ILLIMITABLENESS19 pts
- ILLOGICALNESSES18 pts
- ILLUSTRIOUSNESS15 pts
- IMAGINARINESSES18 pts
- IMAGINATIVENESS21 pts
- IMITATIVENESSES20 pts
- IMMATERIALITIES19 pts
- IMMATERIALIZING29 pts
- IMMEDIATENESSES20 pts
- IMMISCIBILITIES23 pts
- IMMOBILIZATIONS30 pts
- IMMORTALIZATION28 pts
- IMMOVABLENESSES24 pts
- IMMUNOASSAYABLE24 pts
- IMMUNOBLOTTINGS22 pts
- IMMUNOCHEMISTRY29 pts
- IMMUNOCOMPETENT25 pts
- IMMUNODEFICIENT25 pts
- IMMUNODIAGNOSES21 pts
- IMMUNODIAGNOSIS21 pts
- IMMUNODIFFUSION26 pts
- IMMUNOGLOBULINS22 pts
- IMMUNOLOGICALLY25 pts
- IMMUNOMODULATOR22 pts
- IMMUNOPATHOLOGY28 pts
- IMMUNOTHERAPIES24 pts
- IMMUTABLENESSES21 pts
- IMPALPABILITIES23 pts
- IMPASSABILITIES21 pts
- IMPASSIBILITIES21 pts
- IMPASSIVENESSES22 pts
- IMPECCABILITIES25 pts
- IMPECUNIOSITIES21 pts
- IMPECUNIOUSNESS21 pts
- IMPENETRABILITY24 pts
- IMPERFECTNESSES24 pts
- IMPERIOUSNESSES19 pts
- IMPERISHABILITY27 pts
- IMPERSONALITIES19 pts
- IMPERSONALIZING29 pts
- IMPETUOUSNESSES19 pts
- IMPLACABILITIES23 pts
- IMPLEMENTATIONS21 pts
- IMPLICATIVENESS24 pts
- IMPONDERABILITY25 pts
- IMPORTUNATENESS19 pts
- IMPOSSIBILITIES21 pts
- IMPOVERISHMENTS27 pts
- IMPRECISENESSES21 pts
- IMPREGNABLENESS22 pts
- IMPRESSIONISTIC21 pts
- IMPROBABILITIES23 pts
- IMPROVABILITIES24 pts
- IMPROVISATIONAL22 pts
- IMPROVISATORIAL22 pts
- IMPULSIVENESSES22 pts
- INACCESSIBILITY24 pts
- INADMISSIBILITY23 pts
- INALTERABLENESS17 pts
- INANIMATENESSES17 pts
- INAPPLICABILITY26 pts
- INAPPROPRIATELY24 pts
- INATTENTIVENESS18 pts
- INCALCULABILITY24 pts
- INCAPABLENESSES21 pts
- INCAPACITATIONS21 pts
- INCLUSIVENESSES20 pts
- INCOMMENSURABLE23 pts
- INCOMMENSURABLY26 pts
- INCOMMUNICATIVE26 pts
- INCOMPARABILITY26 pts
- INCOMPATIBILITY26 pts
- INCOMPREHENSION24 pts
- INCONGRUOUSNESS18 pts
- INCONSEQUENTIAL26 pts
- INCONSIDERATELY21 pts
- INCONSIDERATION18 pts
- INCONSISTENCIES19 pts
- INCONSPICUOUSLY24 pts
- INCONVENIENCIES22 pts
- INCONVENIENCING23 pts
- INCOORDINATIONS18 pts
- INCORRECTNESSES19 pts
- INCORRIGIBILITY23 pts
- INCORRUPTNESSES19 pts
- INCREDIBILITIES20 pts
- INCREMENTALISMS21 pts
- INCREMENTALISTS19 pts
- INCURIOUSNESSES17 pts
- INDEFEASIBILITY24 pts
- INDEFECTIBILITY26 pts
- INDEFENSIBILITY24 pts
- INDEFINABLENESS21 pts
- INDEMNIFICATION23 pts
- INDETERMINACIES20 pts
- INDETERMINATELY21 pts
- INDETERMINATION18 pts
- INDETERMINISTIC20 pts
- INDIFFERENTISMS24 pts
- INDIFFERENTISTS22 pts
- INDIGENIZATIONS26 pts
- INDIGESTIBILITY22 pts
- INDISCIPLINABLE22 pts
- INDISSOLUBILITY21 pts
- INDIVIDUALISING21 pts
- INDIVIDUALISTIC22 pts
- INDIVIDUALITIES20 pts
- INDIVIDUALIZING30 pts
- INDOCTRINATIONS18 pts
- INDOMITABLENESS20 pts
- INDUBITABLENESS20 pts
- INDUSTRIALISING17 pts
- INDUSTRIALIZING26 pts
- INDUSTRIOUSNESS16 pts
- INEDUCABILITIES20 pts
- INEFFABLENESSES23 pts
- INEFFACEABILITY28 pts
- INEFFECTIVENESS26 pts
- INEFFECTUALNESS23 pts
- INEFFICACIOUSLY28 pts
- INELIGIBILITIES18 pts
- INERADICABILITY23 pts
- INEVITABILITIES20 pts
- INEXCUSABLENESS26 pts
- INEXORABILITIES24 pts
- INEXPENSIVENESS27 pts
- INEXPLICABILITY31 pts
- INEXTRICABILITY29 pts
- INFALLIBILITIES20 pts
- INFANTILIZATION27 pts
- INFEASIBILITIES20 pts
- INFINITESIMALLY23 pts
- INFLAMMABLENESS24 pts
- INFLEXIBILITIES27 pts
- INFORMATIONALLY23 pts
- INFORMATIVENESS23 pts
- INFRASTRUCTURES20 pts
- INFUNDIBULIFORM26 pts
- INFUSIBLENESSES20 pts
- INGENIOUSNESSES16 pts
- INGENUOUSNESSES16 pts
- INHERITABLENESS20 pts
- INHOMOGENEITIES21 pts
- INHOSPITALITIES20 pts
- INITIALIZATIONS24 pts
- INJUDICIOUSNESS25 pts
- INJURIOUSNESSES22 pts
- INNOCUOUSNESSES17 pts
- INOFFENSIVENESS24 pts
- INOPERATIVENESS20 pts
- INOPPORTUNENESS19 pts
- INQUISITIVENESS27 pts
- INQUISITORIALLY27 pts
- INSATIABILITIES17 pts
- INSATIATENESSES15 pts
- INSCRUTABLENESS19 pts
- INSENSIBILITIES17 pts
- INSENSITIVENESS18 pts
- INSENSITIVITIES18 pts
- INSEPARABLENESS19 pts
- INSIDIOUSNESSES16 pts
- INSIGNIFICANCES23 pts
- INSIGNIFICANTLY24 pts
- INSOCIABILITIES19 pts
- INSOLUBLENESSES17 pts
- INSPIRATIONALLY20 pts
- INSTANTANEITIES15 pts
- INSTANTANEOUSLY18 pts
- INSTITUTIONALLY18 pts
- INSTRUCTIVENESS20 pts
- INSTRUCTORSHIPS22 pts
- INSTRUMENTALISM19 pts
- INSTRUMENTALIST17 pts
- INSTRUMENTALITY20 pts
- INSTRUMENTATION17 pts
- INSUBORDINATELY21 pts
- INSUBORDINATION18 pts
- INSUFFICIENCIES25 pts
- INSURRECTIONARY20 pts
- INSURRECTIONIST17 pts
- INTANGIBILITIES18 pts
- INTEGRABILITIES18 pts
- INTEGRATIONISTS16 pts
- INTELLECTUALISM19 pts
- INTELLECTUALIST17 pts
- INTELLECTUALITY20 pts
- INTELLECTUALIZE26 pts
- INTELLIGENTSIAS16 pts
- INTELLIGIBILITY21 pts
- INTEMPERATENESS19 pts
- INTENSIFICATION20 pts
- INTENSIVENESSES18 pts
- INTERANIMATIONS17 pts
- INTERBEHAVIORAL23 pts
- INTERCHANGEABLE23 pts
- INTERCHANGEABLY26 pts
- INTERCOLLEGIATE18 pts
- INTERCOMMUNIONS21 pts
- INTERCOMPARISON21 pts
- INTERCONNECTING20 pts
- INTERCONNECTION19 pts
- INTERCONVERSION20 pts
- INTERCONVERTING21 pts
- INTERCORRELATED18 pts
- INTERCORRELATES17 pts
- INTERCULTURALLY20 pts
- INTERDEPENDENCE21 pts
- INTERDEPENDENCY24 pts
- INTERDIFFUSIONS22 pts
- INTERDIGITATING18 pts
- INTERDIGITATION17 pts
- INTERDIVISIONAL19 pts
- INTERELECTRODES18 pts
- INTERELECTRONIC19 pts
- INTERESTINGNESS16 pts
- INTERFEROMETERS20 pts
- INTERFEROMETRIC22 pts
- INTERFRATERNITY21 pts
- INTERGENERATION16 pts
- INTERGRADATIONS17 pts
- INTERINDIVIDUAL20 pts
- INTERINFLUENCED21 pts
- INTERINFLUENCES20 pts
- INTERIORIZATION24 pts
- INTERLACUSTRINE17 pts
- INTERLINEATIONS15 pts
- INTERMEDIATIONS18 pts
- INTERMITTENCIES19 pts
- INTERMODULATION18 pts
- INTERNALIZATION24 pts
- INTERNATIONALLY18 pts
- INTERNUCLEOTIDE18 pts
- INTEROPERATIVES20 pts
- INTERPAROXYSMAL29 pts
- INTERPELLATIONS17 pts
- INTERPENETRATED18 pts
- INTERPENETRATES17 pts
- INTERPERCEPTUAL21 pts
- INTERPERMEATING20 pts
- INTERPERSONALLY20 pts
- INTERPHALANGEAL21 pts
- INTERPOPULATION19 pts
- INTERPRETATIONS17 pts
- INTERPROVINCIAL22 pts
- INTERROGATIONAL16 pts
- INTERROGATIVELY22 pts
- INTERROGATORIES16 pts
- INTERSCHOLASTIC22 pts
- INTERSTRATIFIED19 pts
- INTERSTRATIFIES18 pts
- INTERSUBJECTIVE29 pts
- INTERTWINEMENTS20 pts
- INTERUNIVERSITY21 pts
- INTERVALOMETERS20 pts
- INTERVENTIONISM20 pts
- INTERVENTIONIST18 pts
- INTERVISIBILITY23 pts
- INTERVISITATION18 pts
- INTOLERABLENESS17 pts
- INTRACELLULARLY20 pts
- INTRACEREBRALLY22 pts
- INTRAMUSCULARLY22 pts
- INTRANSIGEANCES18 pts
- INTRANSIGEANTLY19 pts
- INTRAPERITONEAL17 pts
- INTRAPOPULATION19 pts
- INTRAPRENEURIAL17 pts
- INTRAVASCULARLY23 pts
- INTRICATENESSES17 pts
- INTROSPECTIONAL19 pts
- INTROSPECTIVELY25 pts
- INTRUSIVENESSES18 pts
- INTUITIVENESSES18 pts
- INTUSSUSCEPTING20 pts
- INTUSSUSCEPTION19 pts
- INTUSSUSCEPTIVE22 pts
- INVARIABILITIES20 pts
- INVECTIVENESSES23 pts
- INVENTIVENESSES21 pts
- INVESTIGATIONAL19 pts
- INVIDIOUSNESSES19 pts
- INVINCIBILITIES22 pts
- INVIOLABILITIES20 pts
- INVIOLATENESSES18 pts
- INVISIBLENESSES20 pts
- INVOLUNTARINESS18 pts
- INVULNERABILITY23 pts
- IONOSPHERICALLY25 pts
- IRASCIBLENESSES19 pts
- IRRATIONALISTIC17 pts
- IRRATIONALITIES15 pts
- IRRECONCILABLES21 pts
- IRREFORMABILITY25 pts
- IRREFRAGABILITY24 pts
- IRREPARABLENESS19 pts
- IRREPEALABILITY22 pts
- IRRESISTIBILITY20 pts
- IRREVERSIBILITY23 pts
- IRREVOCABLENESS22 pts
- IRRITABLENESSES17 pts
Point values shown are Scrabble® (letters only, before board bonuses). Browse deeper via the word-lists hub.
Top 10 highest-scoring words
Scored on letters only (no board bonuses). WWF uses different tile values from Scrabble — J, Q and Z are worth 10 points in WWF; X is worth 8.
| # | Word | Scrabble | WWF |
|---|---|---|---|
| 1 | inexplicability | 31 | 36 |
| 2 | individualizing | 30 | 36 |
| 3 | immobilizations | 30 | 35 |
| 4 | intersubjective | 29 | 36 |
| 5 | impersonalizing | 29 | 35 |
| 6 | immaterializing | 29 | 34 |
| 7 | immunochemistry | 29 | 33 |
| 8 | inextricability | 29 | 32 |
| 9 | interparoxysmal | 29 | 32 |
| 10 | immunopathology | 28 | 33 |
Strategy for this list
I is worth 1 in Scrabble and is the second-most-common vowel in English. I starts fewer words than A or E (~3,500) but includes essential short plays (IF, IN, IS, IT) and the entire -ING family. High-value I-openers include IZAR, IAMBIC, IVORY. In Wordle, I is common in position 2 and 3 but rarely in position 1 for answers — an I-opening guess is usually testing for I in interior positions, not the front.
FAQs
How many 15-letter words start with I?
308 valid 15-letter English words begin with I in the ENABLE English word list.
Are these valid in Wordle and Scrabble?
Words on this page come from the ENABLE English word list. UK Scrabble (Collins Scrabble Words) accepts the overwhelming majority; a handful may not be legal in the North American NASPA Word List (NWL2023).