cheerer vs watcher

cheerer and watcher both are nouns.

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

As nouns, watcher is a hypernym of cheerer; that is, watcher is a word with a broader meaning than cheerer:

cheerer: a spectator who shouts encouragement
watcher: a close observer; someone who looks at something (such as an exhibition of some kind)

Other hypernyms of cheerer include looker, spectator, viewer, witness.

cheerer (noun)	watcher (noun)
a spectator who shouts encouragement	a guard who keeps watch
	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