NIMBY vs objector

NIMBY and objector both are nouns.

Word	Noun	Adjective	Verb	Adverb
NIMBY	Yes	No	No	No
objector	Yes	No	No	No

As nouns, objector is a hypernym of NIMBY; that is, objector is a word with a broader meaning than NIMBY:

NIMBY: someone who objects to siting something in their own neighborhood but does not object to it being sited elsewhere; an acronym for not in my backyard
objector: a person who dissents from some established policy

Other hypernyms of NIMBY include contestant, dissenter, dissident, protester.

NIMBY (noun)	objector (noun)
someone who objects to siting something in their own neighborhood but does not object to it being sited elsewhere; an acronym for not in my backyard	a person who dissents from some established policy