war whoop vs yell

war whoop and yell both are nouns.

Word	Noun	Adjective	Verb	Adverb
war whoop	Yes	No	No	No
yell	Yes	No	Yes	No

As nouns, yell is a hypernym of war whoop; that is, yell is a word with a broader meaning than war whoop:

Other hypernyms of war whoop include call, cry, outcry, shout, vociferation.

war whoop (noun)	yell (noun)
a yell intended to rally a group of soldiers in battle	a loud utterance; often in protest or opposition
	a loud utterance of emotion (especially when inarticulate)

war whoop (verb)	yell (verb)
	utter or declare in a very loud voice
	utter a sudden loud cry