objector vs dissenter

objector and dissenter both are nouns.

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

As nouns, objector and dissenter are synonyms defined as:

objector and dissenter: a person who dissents from some established policy

Other synonyms of objector include contestant, dissident, protester.

objector (noun)	dissenter (noun)
a person who dissents from some established policy	a person who dissents from some established policy