yodel vs yell

yodel and yell both are nouns.

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

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

yodel: a songlike cry in which the voice fluctuates rapidly between the normal voice and falsetto
yell: a loud utterance; often in protest or opposition

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

yodel (noun)	yell (noun)
a songlike cry in which the voice fluctuates rapidly between the normal voice and falsetto	a loud utterance; often in protest or opposition
	a loud utterance of emotion (especially when inarticulate)

yodel (verb)	yell (verb)
sing by changing register; sing by yodeling	utter or declare in a very loud voice
	utter a sudden loud cry