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List of 12-letter words containing

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There are 20 twelve-letter words containing 2O, 2P, 2S and U

OPPORTUNISMSopportunisms n. Plural of opportunism.
OPPORTUNISM n. the practice of regulating actions by favourable opportunities rather than consistent principles.
OPPORTUNISTSopportunists n. Plural of opportunist.
OPPORTUNIST n. one that is opportunistic or that practices opportunism.
PHOSPHONIUMSphosphoniums n. Plural of phosphonium.
PHOSPHONIUM n. the radical PH4, analogous to ammonium.
PHOSPHORUSESphosphoruses n. Plural of phosphorus.
PHOSPHORUS n. a chemical element.
PITTOSPORUMSpittosporums n. Plural of pittosporum.
PITTOSPORUM n. any of numerous chiefly subtropical evergreen shrubs or small trees.
POLYSEPALOUSpolysepalous adj. (Botany, of a calyx) having separate sepals.
POLYSEPALOUS adj. having separate sepals.
POMPELMOUSESpompelmouses n. Plural of pompelmous.
pompelmouses n. Plural of pompelmouse.
POMPELMOUSE n. (Dutch) the shaddock or grapefruit, also PAMPELMOOSE, PAMPELMOUSE, POMELO, POMPELMOOSE, POMPELMOUS, POMPELO, PUMELO, PUMMELO.
POPULOUSNESSpopulousness n. The quality of being populous.
POPULOUSNESS n. the state of being populous.
POSTEXPOSUREpostexposure adj. After exposure (To radiation, pathogens, etc.).
POSTEXPOSURE adj. taking place after exposure.
PREPOSTEROUSpreposterous adj. Absurd, or contrary to common sense.
PREPOSTEROUS adj. contrary to nature, reason, or common sense.
PROSAUROPODSprosauropods n. Plural of prosauropod.
PROSAUROPOD n. a reptile-like dinosaur of the division Prosauropoda which lived in the Triassic period.
PROSPEROUSLYprosperously adv. In a prosperous manner; so as to prosper.
PROSPEROUS adv. thriving, affluent.
PSEUDOMORPHSpseudomorphs n. Plural of pseudomorph.
PSEUDOMORPH n. a false or abnormal physical form.
PSEUDOSCOPESpseudoscopes n. Plural of pseudoscope.
PSEUDOSCOPE n. an instrument producing images in reversed relief.
PYROPHORUSESPYROPHORUS n. any substance capable of igniting spontaneously on exposure to air.
SAPROPHAGOUSsaprophagous adj. Feeding on dead or decaying organic matter.
SAPROPHAGOUS adj. feeding on decaying material.
SPOROPHOROUSsporophorous adj. Relating to sporophores.
sporophorous adj. Having spores.
SPOROPHOROUS adj. bearing spores, also SPOROPHORIC.
SUPPOSITIONSsuppositions n. Plural of supposition.
SUPPOSITION n. something that is supposed.
SUPPOSITIOUSsuppositious adj. Spurious; substituted for the genuine, counterfeit; fake; supposititious.
suppositious adj. Imaginary; fictitious, pretended to exist.
suppositious adj. Hypothetical, based on supposition; suppositional.
UNPROSPEROUSunprosperous adj. Not prosperous.
UNPROSPEROUS adj. not prosperous.

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 WikWik.org and 1Word.ws.

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