hollo vs shriek

hollo and shriek both are nouns.

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

As verbs, shriek is a hyponym of hollo; that is, shriek is a word with a more specific, narrower meaning than hollo:

hollo (noun)	shriek (noun)
a very loud utterance (like the sound of an animal)	sharp piercing cry
	a high-pitched noise resembling a human cry

hollo (verb)	shriek (verb)
utter a sudden loud cry	utter a shrill cry
cry hollo
encourage somebody by crying hollo