Found 157 15-letter words starting with O
Highest Scrabble Score
The highest scoring 15-letter word starting with O in Scrabble:
OXYPHENBUTAZONE41 ptsHighest Words With Friends Score
The highest scoring 15-letter word starting with O in WWF:
OXYPHENBUTAZONE44 ptsAbout 15-Letter Words Starting With O
This list contains valid 15-letter words that begin with O. Longer words score higher in Scrabble due to premium tiles and the 50-point bingo bonus. Each word links to its definition page with anagrams and game scores.
15-Letter Words Starting With O
oxyphenbutazone41overemphasizing35overhomogenized34overhomogenizes33overcapitalized32overspecialized32oxytetracycline32objectification31ophthalmoscopic31orthopsychiatry31overcapitalizes31overdramatizing31overfertilizing31overglamorizing31overspecializes31occidentalizing30overcentralized30objectivenesses29ophthalmoscopes29orthogonalizing29overcentralizes29overexpectation29overextravagant29overgeneralized29oversimplifying29overwithholding29ovoviviparously29orthophosphates28overachievement28overadjustments28overexaggerated28overgeneralizes28oligomerization27overclassifying27overcomplicated27overconfidently27overexaggerates27overextractions27overutilization27overzealousness27offhandednesses26ophthalmologies26ophthalmologist26organophosphate26overcommitments26overcommunicate26overcompliances26overcomplicates26overconfidences26overdevelopment26overembellished26overfamiliarity26overidentifying26overprogramming26oxidoreductases26oceanographical25omnicompetences25osteopathically25overcompensated25overcompressing25overembellishes25overprescribing25oversubscribing25obnoxiousnesses24offensivenesses24oligosaccharide24orthodontically24overapplication24overcompensates24overconsumption24overdependences24overdocumenting24overimaginative24oversensitivity24observationally23officiousnesses23oligodendrocyte23openmouthedness23oscillographies23outdoorsmanship23overaccentuated23overadvertising23overconstructed23overcultivation23overenthusiasms23overinvestments23overlengthening23overmedications23overorchestrate23overproductions23overrefinements23overspeculating23observabilities22obstructiveness22overaccentuates22overdiscounting22overdiversities22overencouraging22overindulgences22overpopulations22overproportions22overprotections22overspeculation22obstructionisms21ontogenetically21openheartedness21opprobriousness21optoelectronics21organochlorines21outspokennesses21overarticulated21overcontrolling21overdecorations21overelaborating21overevaluations21overopinionated21overornamenting21overrepresented21overstimulating21oversweetnesses21obliviousnesses20obsessivenesses20obtrusivenesses20omnidirectional20operativenesses20orchestrational20organomercurial20organometallics20osteomyelitises20outmanipulating20overarticulates20overassessments20overelaboration20overengineering20overestimations20overpersuasions20overstabilities20overstimulation20obstructionists19obtainabilities19odoriferousness19oligodendroglia19oligonucleotide19operationalisms19opportunenesses19orthogonalities19overeagernesses19overentertained19overingenuities19overregulations19opinionatedness18orientationally18osmoregulations18overintensities18oversaturations18obstinatenesses17operationalists17