gawker vs viewer

gawker and viewer both are nouns.

Word	Noun	Adjective	Verb	Adverb
gawker	Yes	No	No	No
viewer	Yes	No	No	No

As nouns, viewer is a hypernym of gawker; that is, viewer is a word with a broader meaning than gawker:

gawker: a spectator who stares stupidly without intelligent awareness
viewer: a close observer; someone who looks at something (such as an exhibition of some kind)

Other hypernyms of gawker include looker, spectator, watcher, witness.

gawker (noun)	viewer (noun)
a spectator who stares stupidly without intelligent awareness	an optical device for viewing photographic transparencies
	a close observer; someone who looks at something (such as an exhibition of some kind)