roar vs yawp

roar is a noun but yawp is not a noun.

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

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

Other hyponyms of roar include vroom, bawl, thunder.

roar (noun)	yawp (noun)
a very loud utterance (like the sound of an animal)
a deep prolonged loud noise
the sound made by a lion

roar (verb)	yawp (verb)
laugh unrestrainedly and heartily	complain whiningly
make a loud noise, as of wind, water, or vehicles	make a raucous noise
emit long loud cries
utter words loudly and forcefully
make a loud noise, as of animal
act or proceed in a riotous, turbulent, or disorderly way