rubbernecker vs looker

rubbernecker and looker both are nouns.

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

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

rubbernecker: a person who stares inquisitively
looker: a close observer; someone who looks at something (such as an exhibition of some kind)

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

rubbernecker (noun)	looker (noun)
a person who stares inquisitively	a very attractive or seductive looking woman
	a close observer; someone who looks at something (such as an exhibition of some kind)