ultraconservative vs reactionary

ultraconservative and reactionary both are nouns.

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

As nouns, ultraconservative and reactionary are synonyms defined as:

ultraconservative and reactionary: an extreme conservative; an opponent of progress or liberalism

Other synonyms of ultraconservative include extreme right-winger.

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

ultraconservative (adjective)	reactionary (adjective)
extremely conservative	opposed to political or social liberalism or reform