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There are 3 twelve-letter words beginning with PROTA

PROTACTINIUMprotactinium n. A chemical element (symbol Pa) with atomic number 91: a dense, silvery-gray actinide metal.
PROTACTINIUM n. a radioactive metallic chemical element, a member of the actinide series which occurs as a decay product in uranium ores.
PROTAGONISMSPROTAGONISM n. the state of being a protagonist.
PROTAGONISTSprotagonists n. Plural of protagonist.
PROTAGONIST n. the principal character in a literary work.

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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