spectator vs watcher

spectator and watcher both are nouns.

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

As nouns, spectator and watcher are synonyms defined as:

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

Other synonyms of spectator include looker, viewer, witness.

spectator (noun)	watcher (noun)
a woman's pump with medium heel; usually in contrasting colors for toe and heel	a guard who keeps watch
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