eyewitness vs looker

eyewitness and looker both are nouns.

Word	Noun	Adjective	Verb	Adverb
eyewitness	Yes	No	Yes	No
looker	Yes	No	No	No

As nouns, looker is a hypernym of eyewitness; that is, looker is a word with a broader meaning than eyewitness:

eyewitness: a spectator who can describe what happened
looker: a close observer; someone who looks at something (such as an exhibition of some kind)

Other hypernyms of eyewitness include spectator, viewer, watcher, witness.

eyewitness (noun)	looker (noun)
a spectator who can describe what happened	a very attractive or seductive looking woman
	a close observer; someone who looks at something (such as an exhibition of some kind)

eyewitness (verb)	looker (verb)
be present at an event and see it with one's own eyes