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There are 7 fifteen-letter words containing 4O, 2P and S

HYPOPHOSPHOROUShypophosphorous adj. (Chemistry) Of or pertaining to hypophosphorous acid or its derivatives.
HYPOPHOSPHOROUS adj. as in hypophosphorous acid, a monobasic acid and a reducing agent.
OESOPHAGOSCOPESoesophagoscopes n. Plural of oesophagoscope.
OESOPHAGOSCOPE n. an instrument for examining the oesophagus.
OMOPLATOSCOPIESOMOPLATOSCOPY n. divination by observing the cracks in a burning shoulder-blade.
ORTHOPHOSPHORICorthophosphoric adj. (Chemistry) Describing the ordinary form of phosphoric acid and its derivatives.
ORTHOPHOSPHORIC adj. phosphoric.
OVERPROPORTIONSoverproportions v. Third-person singular simple present indicative form of overproportion.
OVERPROPORTION v. to make disproportionately large.
PHOSPHOROSCOPESphosphoroscopes n. Plural of phosphoroscope.
PHOSPHOROSCOPE n. an instrument for measuring the duration of phosphorescence after the source of radiation causing it has been removed.
PHOTOAUTOTROPHSphotoautotrophs n. Plural of photoautotroph.
PHOTOAUTOTROPH n. an organism capable of synthesizing its own food from inorganic substances using light as an energy source.

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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