roar vs shout

roar and shout both are nouns.

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

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

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

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

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

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

roar: utter words loudly and forcefully
shout: utter in a loud voice; talk in a loud voice (usually denoting characteristic manner of speaking)

roar (noun)	shout (noun)
a very loud utterance (like the sound of an animal)	a loud utterance; often in protest or opposition
a deep prolonged loud noise
the sound made by a lion

roar (verb)	shout (verb)
laugh unrestrainedly and heartily	utter in a loud voice; talk in a loud voice (usually denoting characteristic manner of speaking)
make a loud noise, as of wind, water, or vehicles	utter a sudden loud cry
emit long loud cries	utter aloud; often with surprise, horror, or joy
utter words loudly and forcefully	use foul or abusive language towards
make a loud noise, as of animal
act or proceed in a riotous, turbulent, or disorderly way