lens vs optic

lens and optic both are nouns.

Word	Noun	Adjective	Verb	Adverb
lens	Yes	No	No	No
optic	Yes	Yes	No	No

lens (noun)	optic (noun)
a transparent optical device used to converge or diverge transmitted light and to form images	the organ of sight
electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons
biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina
(metaphor) a channel through which something can be seen or understood

lens (adjective)	optic (adjective)
	of or relating to or resembling the eye
	relating to or using sight