roar vs wail

roar and wail both are nouns.

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

As verbs, roar and wail are synonyms defined as:

Other synonyms of roar include howl, ululate, yaup, yawl.

roar (noun)	wail (noun)
a very loud utterance (like the sound of an animal)	a cry of sorrow and grief
a deep prolonged loud noise
the sound made by a lion

roar (verb)	wail (verb)
laugh unrestrainedly and heartily	cry weakly or softly
make a loud noise, as of wind, water, or vehicles	emit long loud cries
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