9-Letter Words That Start With: OPTO There are 3 9-letter words, 0 9-letter phrases and 0 9-letter abbr's that start with OPTO. Did you mean?All 9 letter wordsAll words starting with OPTOEnding with OPTOContaining OPTOBest ScoringTop 10Top 10 (Default)Top 20Top 50Top 100 Scr US AllScrabble US (Default)Scrabble EUWW FriendsWordFeud All All (Default)VerbNounAdjectiveAdverbExpand?WordSave?LengthUsagePointsTypeoptometry916 nounnnoun • the practice of an optometristoptometer913 nounnnoun • An instrument for measuring the focus of the lens of the eye. Tip: Scrabble EU allows far more words than US! Also change the max length to see more words. All 9 Letter Words Most Common ASC Word A-ZWord Z-AMost Common ASC (Default)Most Common DESCScrabble Points Hi-LoScrabble Points Lo-HiWWF Points Hi-LoWWF Points Lo-HiWordFeud Points Hi-LoWordFeud Lo-HiWords (3)optometry16optometer13optophone16