ha-ha vs laugh

ha-ha and laugh both are nouns.

Word	Noun	Adjective	Verb	Adverb
ha-ha	Yes	No	No	No
laugh	Yes	No	Yes	No

As nouns, laugh is a hypernym of ha-ha; that is, laugh is a word with a broader meaning than ha-ha:

Other hypernyms of ha-ha include laughter.

ha-ha (noun)	laugh (noun)
a ditch with one side being a retaining wall; used to divide lands without defacing the landscape	the sound of laughing
a loud laugh that sounds like a horse neighing	a humorous anecdote or remark intended to provoke laughter
	a facial expression characteristic of a person laughing

ha-ha (verb)	laugh (verb)
	produce laughter