lens vs oculus

lens and oculus both are nouns.

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

lens (noun)	oculus (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