clamour vs yell

clamour and yell both are nouns.

Word	Noun	Adjective	Verb	Adverb
clamour	Yes	No	Yes	No
yell	Yes	No	Yes	No

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

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

clamour (noun)	yell (noun)
loud and persistent outcry from many people	a loud utterance; often in protest or opposition
	a loud utterance of emotion (especially when inarticulate)

clamour (verb)	yell (verb)
utter or proclaim insistently and noisily	utter or declare in a very loud voice
make loud demands	utter a sudden loud cry