conservative vs buttoned-up

conservative is a noun but buttoned-up is not a noun.

Word	Noun	Adjective	Verb	Adverb
conservative	Yes	Yes	No	No
buttoned-up	No	Yes	No	No

conservative (noun)	buttoned-up (noun)
a person who is reluctant to accept changes and new ideas

conservative (adjective)	buttoned-up (adjective)
resistant to change, particularly in relation to politics or religion	conservative in professional manner
unimaginatively conventional	(British colloquial) not inclined to conversation
conforming to the standards and conventions of the middle class
avoiding excess
having social or political views favoring conservatism