similar vs correspondent

similar is not a noun while correspondent is a noun.

Word	Noun	Adjective	Verb	Adverb
similar	No	Yes	No	No
correspondent	Yes	Yes	No	No

similar (noun)	correspondent (noun)
	someone who communicates by means of letters
	a journalist employed to provide news stories for newspapers or broadcast media

similar (adjective)	correspondent (adjective)
marked by correspondence or resemblance	similar or equivalent in some respects though otherwise dissimilar
resembling or similar; having the same or some of the same characteristics; often used in combination
having the same or similar characteristics
capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability
(of words) expressing closely related meanings