laugh vs scream

laugh and scream both are nouns.

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

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

laugh (noun)	scream (noun)
the sound of laughing	sharp piercing cry
a humorous anecdote or remark intended to provoke laughter	a joke that seems extremely funny
a facial expression characteristic of a person laughing	a high-pitched noise resembling a human cry

laugh (verb)	scream (verb)
produce laughter	utter a sudden loud cry
	utter or declare in a very loud voice
	make a loud, piercing sound