war cry vs yell

war cry and yell both are nouns.

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

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

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

war cry (noun)	yell (noun)
a yell intended to rally a group of soldiers in battle	a loud utterance; often in protest or opposition
a slogan used to rally support for a cause	a loud utterance of emotion (especially when inarticulate)

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