watcher vs moviegoer

watcher and moviegoer both are nouns.

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

As nouns, moviegoer is a hyponym of watcher; that is, moviegoer is a word with a more specific, narrower meaning than watcher:

watcher: a close observer; someone who looks at something (such as an exhibition of some kind)
moviegoer: someone who goes to see movies

watcher (noun)	moviegoer (noun)
a guard who keeps watch	someone who goes to see movies
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