eyewitness vs spectator

eyewitness and spectator both are nouns.

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

As nouns, spectator is a hypernym of eyewitness; that is, spectator is a word with a broader meaning than eyewitness:

eyewitness: a spectator who can describe what happened
spectator: a close observer; someone who looks at something (such as an exhibition of some kind)

Other hypernyms of eyewitness include looker, viewer, watcher, witness.

eyewitness (noun)	spectator (noun)
a spectator who can describe what happened	a woman's pump with medium heel; usually in contrasting colors for toe and heel
	a close observer; someone who looks at something (such as an exhibition of some kind)

eyewitness (verb)	spectator (verb)
be present at an event and see it with one's own eyes