scream vs howl

scream and howl both are nouns.

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

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

scream (noun)	howl (noun)
sharp piercing cry	a long loud emotional utterance
a joke that seems extremely funny	a loud sustained noise resembling the cry of a hound
a high-pitched noise resembling a human cry	the long plaintive cry of a hound or a wolf

scream (verb)	howl (verb)
utter a sudden loud cry	laugh unrestrainedly and heartily
utter or declare in a very loud voice	make a loud noise, as of wind, water, or vehicles
make a loud, piercing sound	emit long loud cries
	cry loudly, as of animals