shriek vs holler

shriek and holler both are nouns.

Word	Noun	Adjective	Verb	Adverb
shriek	Yes	No	Yes	No
holler	Yes	No	Yes	No

As verbs, holler is a hypernym of shriek; that is, holler is a word with a broader meaning than shriek:

Other hypernyms of shriek include call, cry, hollo, scream, shout, shout out, squall, yell.

shriek (noun)	holler (noun)
sharp piercing cry	a very loud utterance (like the sound of an animal)
a high-pitched noise resembling a human cry	a small valley between mountains