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There are 5 nine-letter words beginning with CATALYS

CATALYSED	• catalysed v. Simple past tense and past participle of catalyse. • CATALYSE v. to act as a catalyst, also CATALYZE.
CATALYSER	• catalyser n. (British spelling) Alternative form of catalyzer. • CATALYSER n. an agent that catalyzes, also CATALYZER.
CATALYSES	• catalyses n. Plural of catalysis. • catalyses v. Third-person singular simple present indicative form of catalyse. • CATALYSE v. to act as a catalyst, also CATALYZE.
CATALYSIS	• catalysis n. (Chemistry) The increase of the rate of a chemical reaction, induced by a catalyst. • CATALYSIS n. alteration in speed of chemical reaction due to introduction of a substance which remains unchanged.
CATALYSTS	• catalysts n. Plural of catalyst. • CATALYST n. a substance that speeds a chemical reaction.

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: 5 words
Scrabble in French: 7 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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