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4-letter words (6 found)
OBAS,OCAS,ODAS,OKAS,OMAS,OPAS,
5-letter words (9 found)
OBIAS,OCTAS,OHIAS,OKRAS,OKTAS,OLLAS,ORCAS,OUMAS,OUPAS,
6-letter words (10 found)
OCREAS,OILGAS,OMEGAS,OPERAS,ORGIAS,ORIXAS,OSSIAS,OUBAAS,OUIJAS,OUTGAS,
7-letter words (11 found)
OBELIAS,OCHREAS,OEDEMAS,OMERTAS,ONYCHAS,ORBITAS,ORISHAS,OSETRAS,OTTAVAS,OUGIYAS,OZAENAS,
8-letter words (18 found)
OCARINAS,OCTAPLAS,OLEARIAS,OLESTRAS,OMNIANAS,ONDATRAS,ONYCHIAS,OPHIURAS,OPUNTIAS,OQUASSAS,ORGANZAS,OROPESAS,OSMUNDAS,OSSETRAS,OSTEOMAS,OTALGIAS,OUGUIYAS,OVERSEAS,
9-letter words (9 found)
ODONTOMAS,OITICICAS,OLIGEMIAS,OLIGURIAS,OMBRELLAS,ONGAONGAS,OPERETTAS,ORCHELLAS,ORCHILLAS,
10-letter words (8 found)
OENOMANIAS,OENOTHERAS,OLIGAEMIAS,OMOPHAGIAS,OPSOMANIAS,ORCHESTRAS,OSSIFRAGAS,OTORRHOEAS,
11-letter words (7 found)
ODONTALGIAS,OPHTHALMIAS,ORTHOPEDIAS,ORTHOPNOEAS,ORTHOREXIAS,OSTEOCOLLAS,OUVIRANDRAS,
12-letter words (4 found)
OCHLOPHOBIAS,ONEIRODYNIAS,ORCHESTRINAS,ORTHODONTIAS,
13-letter words (6 found)
ODONTOPHOBIAS,OLIGOSPERMIAS,ONOMATOPOEIAS,ORCHIDOMANIAS,OSTEOMALACIAS,OSTEOSARCOMAS,
14-letter words (1 found)
ORNITHOPHOBIAS,
15-letter words (1 found)
OLIGOCYTHAEMIAS,
You can make 90 words starting with o and ending with as according to the Scrabble US and Canada dictionary.