far-right vs reactionary

far-right is not a noun while reactionary is a noun.

Word	Noun	Adjective	Verb	Adverb
far-right	No	Yes	No	No
reactionary	Yes	Yes	No	No

As adjectives, far-right and reactionary are synonyms defined as:

far-right and reactionary: opposed to political or social liberalism or reform

Other synonyms of far-right include reactionist.

far-right (noun)	reactionary (noun)
	an extreme conservative; an opponent of progress or liberalism

far-right (adjective)	reactionary (adjective)
opposed to political or social liberalism or reform	opposed to political or social liberalism or reform