screech vs yell

screech and yell both are nouns.

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

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

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

As verbs, yell is a hypernym of screech; that is, yell is a word with a broader meaning than screech:

Other hypernyms of screech include call, cry, holler, hollo, scream, shout, shout out, squall.

screech (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)

screech (verb)	yell (verb)
utter a harsh abrupt scream	utter or declare in a very loud voice
make a high-pitched, screeching noise	utter a sudden loud cry