laugh vs thigh-slapper

laugh and thigh-slapper both are nouns.

Word	Noun	Adjective	Verb	Adverb
laugh	Yes	No	Yes	No
thigh-slapper	Yes	No	No	No

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

laugh (noun)	thigh-slapper (noun)
the sound of laughing	a joke that seems extremely funny
a humorous anecdote or remark intended to provoke laughter
a facial expression characteristic of a person laughing

laugh (verb)	thigh-slapper (verb)
produce laughter