viewer vs looker

viewer and looker both are nouns.

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

As nouns, viewer and looker are synonyms defined as:

viewer and looker: a close observer; someone who looks at something (such as an exhibition of some kind)

Other synonyms of viewer include spectator, watcher, witness.

viewer (noun)	looker (noun)
an optical device for viewing photographic transparencies	a very attractive or seductive looking woman
a close observer; someone who looks at something (such as an exhibition of some kind)	a close observer; someone who looks at something (such as an exhibition of some kind)