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There are 4 fourteen-letter words containing OTOP

PHOTOPERIODISM	• photoperiodism n. (Biology) The growth, development and other responses of plants and animals according to the length… • PHOTOPERIODISM n. a plant or animal's response or capacity to respond to photoperiod.
PROTOPLANETARY	• protoplanetary adj. (Astronomy, planets) Of or pertaining to a protoplanet. • protoplanetary adj. Relating to a stage in the life of a red giant star or its protoplanetary nebula during the star’s final… • proto-planetary adj. Alternative form of protoplanetary.
PROTOPLASMATIC	• protoplasmatic adj. (Cytology) Of or relating to protoplasm. • PROTOPLASMATIC adj. of or like protoplasm, also PROTOPLASMAL, PROTOPLASMIC, PROTOPLASTIC.
PROTOPORPHYRIN	• protoporphyrin n. (Biochemistry) Any porphyrin that lacks a central metal ion. • PROTOPORPHYRIN n. metal-free porphyrin derived from blood hemin.

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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English Wiktionary: 54 words
Scrabble in French: 4 words
Scrabble in Spanish: no word
Scrabble in Italian: 4 words
Scrabble in German: no word
Scrabble in Romanian: 33 words

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