wail vs roar

wail and roar both are nouns.

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

As verbs, wail and roar are synonyms defined as:

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

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

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