objective lens vs object lens

objective lens and object lens both are nouns.

Word	Noun	Adjective	Verb	Adverb
objective lens	Yes	No	No	No
object lens	Yes	No	No	No

As nouns, objective lens and object lens are synonyms defined as:

objective lens and object lens: the lens or system of lenses in a telescope or microscope that is nearest the object being viewed

Other synonyms of objective lens include object glass, objective.

objective lens (noun)	object lens (noun)
the lens or system of lenses in a telescope or microscope that is nearest the object being viewed	the lens or system of lenses in a telescope or microscope that is nearest the object being viewed