retina vs cone

retina and cone both are nouns.

Word	Noun	Adjective	Verb	Adverb
retina	Yes	No	No	No
cone	Yes	No	Yes	No

retina (noun)	cone (noun)
the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve	any cone-shaped artifact
	a visual receptor cell in the retina that is sensitive to bright light and to color
	cone-shaped mass of ovule- or spore-bearing scales or bracts
	a shape whose base is a circle and whose sides taper up to a point

retina (verb)	cone (verb)
	make cone-shaped