reactionist vs reactionary

reactionist is not a noun while reactionary is a noun.

Word	Noun	Adjective	Verb	Adverb
reactionist	No	Yes	No	No
reactionary	Yes	Yes	No	No

As adjectives, reactionist and reactionary are synonyms defined as:

reactionist and reactionary: opposed to political or social liberalism or reform

Other synonyms of reactionist include far-right.

reactionist (noun)	reactionary (noun)
	an extreme conservative; an opponent of progress or liberalism

reactionist (adjective)	reactionary (adjective)
opposed to political or social liberalism or reform	opposed to political or social liberalism or reform