watcher vs cheerer

watcher and cheerer both are nouns.

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

As nouns, cheerer is a hyponym of watcher; that is, cheerer 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)
cheerer: a spectator who shouts encouragement

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