shout out vs scream

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

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

As verbs, shout out and scream are synonyms defined as:

Other synonyms of shout out include call, cry, holler, hollo, shout, squall, yell.

shout out (noun)	scream (noun)
	sharp piercing cry
	a joke that seems extremely funny
	a high-pitched noise resembling a human cry

shout out (verb)	scream (verb)
utter a sudden loud cry	utter a sudden loud cry
utter in a very loud voice	utter or declare in a very loud voice
	make a loud, piercing sound