watcher vs looker

watcher and looker both are nouns.

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

As nouns, watcher and looker are synonyms defined as:

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

Other synonyms of watcher include spectator, viewer, witness.

watcher (noun)	looker (noun)
a guard who keeps watch	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)
a person who keeps a devotional vigil by a sick bed or by a dead body