rubberneck vs looker

rubberneck and looker both are nouns.

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

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

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

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

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

rubberneck (verb)	looker (verb)
strain to watch; stare curiously