15 Letter Words Starting with O
There are 159 15-letter English words that start with O, ranging alphabetically from OBJECTIFICATION to OXYTETRACYCLINE. Top Scrabble® scorers on this list: OXYPHENBUTAZONE (41), OVEREMPHASIZING (35), OVERHOMOGENIZED (34). The longest entry here is OBJECTIFICATION at 15 letters.
Word list
O
- OBJECTIFICATION31 pts
- OBJECTIVENESSES29 pts
- OBLIVIOUSNESSES20 pts
- OBNOXIOUSNESSES24 pts
- OBSERVABILITIES22 pts
- OBSERVATIONALLY23 pts
- OBSESSIVENESSES20 pts
- OBSTINATENESSES17 pts
- OBSTRUCTIONISMS21 pts
- OBSTRUCTIONISTS19 pts
- OBSTRUCTIVENESS22 pts
- OBTAINABILITIES19 pts
- OBTRUSIVENESSES20 pts
- OCCIDENTALIZING30 pts
- OCEANOGRAPHICAL25 pts
- ODORIFEROUSNESS19 pts
- OFFENSIVENESSES24 pts
- OFFHANDEDNESSES26 pts
- OFFICIOUSNESSES23 pts
- OLIGODENDROCYTE23 pts
- OLIGODENDROGLIA19 pts
- OLIGOMERIZATION27 pts
- OLIGONUCLEOTIDE19 pts
- OLIGOSACCHARIDE24 pts
- OMNICOMPETENCES25 pts
- OMNIDIRECTIONAL20 pts
- ONTOGENETICALLY21 pts
- OPENHEARTEDNESS21 pts
- OPENMOUTHEDNESS23 pts
- OPERATIONALISMS19 pts
- OPERATIONALISTS17 pts
- OPERATIVENESSES20 pts
- OPHTHALMOLOGIES26 pts
- OPHTHALMOLOGIST26 pts
- OPHTHALMOSCOPES29 pts
- OPHTHALMOSCOPIC31 pts
- OPINIONATEDNESS18 pts
- OPPORTUNENESSES19 pts
- OPPROBRIOUSNESS21 pts
- OPTOELECTRONICS21 pts
- ORCHESTRATIONAL20 pts
- ORGANOCHLORINES21 pts
- ORGANOMERCURIAL20 pts
- ORGANOMETALLICS20 pts
- ORGANOPHOSPHATE26 pts
- ORIENTATIONALLY18 pts
- ORTHODONTICALLY24 pts
- ORTHOGONALITIES19 pts
- ORTHOGONALIZING29 pts
- ORTHOPHOSPHATES28 pts
- ORTHOPSYCHIATRY31 pts
- OSCILLOGRAPHIES23 pts
- OSMOREGULATIONS18 pts
- OSTEOMYELITIDES21 pts
- OSTEOPATHICALLY25 pts
- OUTDOORSMANSHIP23 pts
- OUTMANIPULATING20 pts
- OUTSPOKENNESSES21 pts
- OVERABSTRACTING23 pts
- OVERACCENTUATED23 pts
- OVERACCENTUATES22 pts
- OVERACHIEVEMENT28 pts
- OVERADJUSTMENTS28 pts
- OVERADVERTISING23 pts
- OVERAPPLICATION24 pts
- OVERARTICULATED21 pts
- OVERARTICULATES20 pts
- OVERASSESSMENTS20 pts
- OVERCAPITALIZED32 pts
- OVERCAPITALIZES31 pts
- OVERCENTRALIZED30 pts
- OVERCENTRALIZES29 pts
- OVERCLASSIFYING27 pts
- OVERCOMMITMENTS26 pts
- OVERCOMMUNICATE26 pts
- OVERCOMPENSATED25 pts
- OVERCOMPENSATES24 pts
- OVERCOMPLIANCES26 pts
- OVERCOMPLICATED27 pts
- OVERCOMPLICATES26 pts
- OVERCOMPRESSING25 pts
- OVERCONFIDENCES26 pts
- OVERCONFIDENTLY27 pts
- OVERCONSTRUCTED23 pts
- OVERCONSUMPTION24 pts
- OVERCONTROLLING21 pts
- OVERCORRECTIONS22 pts
- OVERCULTIVATION23 pts
- OVERDECORATIONS21 pts
- OVERDEPENDENCES24 pts
- OVERDEVELOPMENT26 pts
- OVERDISCOUNTING22 pts
- OVERDIVERSITIES22 pts
- OVERDOCUMENTING24 pts
- OVERDRAMATIZING31 pts
- OVEREAGERNESSES19 pts
- OVERELABORATING21 pts
- OVERELABORATION20 pts
- OVEREMBELLISHED26 pts
- OVEREMBELLISHES25 pts
- OVEREMPHASIZING35 pts
- OVERENCOURAGING22 pts
- OVERENGINEERING20 pts
- OVERENTERTAINED19 pts
- OVERENTHUSIASMS23 pts
- OVERESTIMATIONS20 pts
- OVEREVALUATIONS21 pts
- OVEREXAGGERATED28 pts
- OVEREXAGGERATES27 pts
- OVEREXPECTATION29 pts
- OVEREXTRACTIONS27 pts
- OVEREXTRAVAGANT29 pts
- OVERFAMILIARITY26 pts
- OVERFERTILIZING31 pts
- OVERGENERALIZED29 pts
- OVERGENERALIZES28 pts
- OVERGLAMORIZING31 pts
- OVERHOMOGENIZED34 pts
- OVERHOMOGENIZES33 pts
- OVERIDENTIFYING26 pts
- OVERIMAGINATIVE24 pts
- OVERINDULGENCES22 pts
- OVERINGENUITIES19 pts
- OVERINTENSITIES18 pts
- OVERINVESTMENTS23 pts
- OVERLENGTHENING23 pts
- OVERMEDICATIONS23 pts
- OVEROPINIONATED21 pts
- OVERORCHESTRATE23 pts
- OVERORNAMENTING21 pts
- OVERPERSUASIONS20 pts
- OVERPOPULATIONS22 pts
- OVERPRESCRIBING25 pts
- OVERPRODUCTIONS23 pts
- OVERPROGRAMMING26 pts
- OVERPROPORTIONS22 pts
- OVERPROTECTIONS22 pts
- OVERREFINEMENTS23 pts
- OVERREGULATIONS19 pts
- OVERREPRESENTED21 pts
- OVERSATURATIONS18 pts
- OVERSENSITIVITY24 pts
- OVERSIMPLIFYING29 pts
- OVERSPECIALIZED32 pts
- OVERSPECIALIZES31 pts
- OVERSPECULATING23 pts
- OVERSPECULATION22 pts
- OVERSTABILITIES20 pts
- OVERSTIMULATING21 pts
- OVERSTIMULATION20 pts
- OVERSUBSCRIBING25 pts
- OVERSWEETNESSES21 pts
- OVERUTILIZATION27 pts
- OVERWITHHOLDING29 pts
- OVERZEALOUSNESS27 pts
- OVOVIVIPAROUSLY29 pts
- OXIDOREDUCTASES26 pts
- OXYPHENBUTAZONE41 pts
- OXYTETRACYCLINE32 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 | oxyphenbutazone | 41 | 44 |
| 2 | overemphasizing | 35 | 39 |
| 3 | overhomogenized | 34 | 37 |
| 4 | overhomogenizes | 33 | 36 |
| 5 | overcapitalized | 32 | 36 |
| 6 | overspecialized | 32 | 36 |
| 7 | oxytetracycline | 32 | 34 |
| 8 | objectification | 31 | 37 |
| 9 | overglamorizing | 31 | 37 |
| 10 | ophthalmoscopic | 31 | 35 |
Strategy for this list
O is worth 1 in Scrabble and starts ~3,500 words. O has three two-letter words (OE, OF, OH, OI, OM, ON, OP, OR, OS, OW, OX, OY) and combines beautifully with X, Z and Y for premium plays. O-openers with premium potential include OYEZ, OZONE, OXBLOOD. In Wordle, O is second-most-common in position 4 (SHOWN, ALONG, ABOUT) but less common in position 1.
FAQs
How many 15-letter words start with O?
159 valid 15-letter English words begin with O 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).