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There are 12 thirteen-letter words containing OPS

ACHROMATOPSIAachromatopsia n. Achromatopia.
ACHROMATOPSIA n. total colour-blindness, where only white, grey and black are visible.
BIOPSYCHOLOGYbiopsychology n. Biological psychology.
BIOPSYCHOLOGY n. the branch of psychology, or of biology, which deals with the interaction of mind and body, and the effects of this interaction.
CHROMATOPSIASchromatopsias n. Plural of chromatopsia.
CHROMATOPSIA n. coloured vision.
ICHTHYOPSIDANICHTHYOPSIDAN n. a member of the Ichthyopsida, amphibians, fishes and fishlike vertebrates, also ICHTHYOPSID.
MONOPSONISTICmonopsonistic adj. Being or pertaining to monopsony.
MONOPSONISTIC adj. relating to monopsony, a market condition with one buyer and many sellers.
OPSONISATIONSOPSONISATION n. the process of opsonising, also OPSONIZATION.
OPSONIZATIONSopsonizations n. Plural of opsonization.
OPSONIZATION n. the process of opsonizing, also OPSONISATION.
PORPHYROPSINSporphyropsins n. Plural of porphyropsin.
PORPHYROPSIN n. a purple pigment in the retinal rods of freshwater fishes that resembles rhodopsin.
PROTOCERATOPSSorry, definition not available.
TRICERATOPSEStriceratopses n. Plural of triceratops.
TRICERATOPS n. a kind of dinosaur.
UNDERDEVELOPSunderdevelops v. Third-person singular simple present indicative form of underdevelop.
UNDERDEVELOP v. to develop insufficiently.
ZOOPSYCHOLOGYzoopsychology n. The study of psychology in animals.
zoöpsychology n. Alternative spelling of zoopsychology.
ZOOPSYCHOLOGY n. the psychology of the lower animals.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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