bellow vs shout

bellow and shout both are nouns.

Word	Noun	Adjective	Verb	Adverb
bellow	Yes	No	Yes	No
shout	Yes	No	Yes	No

As nouns, shout is a hypernym of bellow; that is, shout is a word with a broader meaning than bellow:

Other hypernyms of bellow include call, cry, outcry, vociferation, yell.

As verbs, shout is a hypernym of bellow; that is, shout is a word with a broader meaning than bellow:

bellow: shout loudly and without restraint
shout: utter in a loud voice; talk in a loud voice (usually denoting characteristic manner of speaking)

bellow (noun)	shout (noun)
a very loud utterance (like the sound of an animal)	a loud utterance; often in protest or opposition

bellow (verb)	shout (verb)
shout loudly and without restraint	utter in a loud voice; talk in a loud voice (usually denoting characteristic manner of speaking)
make a loud noise, as of animal	utter a sudden loud cry
	utter aloud; often with surprise, horror, or joy
	use foul or abusive language towards