laugh vs howl

laugh and howl both are nouns.

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

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

laugh (noun)	howl (noun)
the sound of laughing	a long loud emotional utterance
a humorous anecdote or remark intended to provoke laughter	a loud sustained noise resembling the cry of a hound
a facial expression characteristic of a person laughing	the long plaintive cry of a hound or a wolf

laugh (verb)	howl (verb)
produce laughter	laugh unrestrainedly and heartily
	make a loud noise, as of wind, water, or vehicles
	emit long loud cries
	cry loudly, as of animals