screeching vs yell

screeching and yell both are nouns.

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

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

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

screeching (noun)	yell (noun)
sharp piercing cry	a loud utterance; often in protest or opposition
a high-pitched noise resembling a human cry	a loud utterance of emotion (especially when inarticulate)

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