shout out vs shriek

shout out is not a noun while shriek is a noun.

Word	Noun	Adjective	Verb	Adverb
shout out	No	No	Yes	No
shriek	Yes	No	Yes	No

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

Other hyponyms of shout out include hollo, hurrah, halloo, whoop, pipe, pipe up, shrill, howl, roar, ululate, wail, yaup, yawl, screak, screech, skreak, skreigh, squawk.

shout out (noun)	shriek (noun)
	sharp piercing cry
	a high-pitched noise resembling a human cry

shout out (verb)	shriek (verb)
utter a sudden loud cry	utter a shrill cry
utter in a very loud voice