American elk vs stag

American elk and stag both are nouns.

Word	Noun	Adjective	Verb	Adverb
American elk	Yes	No	No	No
stag	Yes	No	Yes	No

As nouns, stag is a hyponym of American elk; that is, stag is a word with a more specific, narrower meaning than American elk:

Other hyponyms of American elk include hart, hind, brocket.

American elk (noun)	stag (noun)
large North American deer with large much-branched antlers in the male	adult male deer
common deer of temperate Europe and Asia	a male deer, especially an adult male red deer

American elk (verb)	stag (verb)
	watch, observe, or inquire secretly
	give away information about somebody
	attend a dance or a party without a female companion