visual system vs eye

visual system and eye both are nouns.

Word	Noun	Adjective	Verb	Adverb
visual system	Yes	No	No	No
eye	Yes	No	Yes	No

visual system (noun)	eye (noun)
the sensory system for vision	a small hole or loop (as in a needle)
	the organ of sight
	good discernment (either visually or as if visually)
	attention to what is seen
	an area that is approximately central within some larger region

visual system (verb)	eye (verb)
	look at