laugh vs roar

laugh and roar both are nouns.

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

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

laugh (noun)	roar (noun)
the sound of laughing	a very loud utterance (like the sound of an animal)
a humorous anecdote or remark intended to provoke laughter	a deep prolonged loud noise
a facial expression characteristic of a person laughing	the sound made by a lion

laugh (verb)	roar (verb)
produce laughter	laugh unrestrainedly and heartily
	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