ha-ha vs haw-haw

ha-ha and haw-haw both are nouns.

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

As nouns, ha-ha and haw-haw are synonyms defined as:

ha-ha and haw-haw: a ditch with one side being a retaining wall; used to divide lands without defacing the landscape

Other synonyms of ha-ha include sunk fence.

As nouns, ha-ha and haw-haw are synonyms defined as:

Other synonyms of ha-ha include hee-haw, horselaugh.

ha-ha (noun)	haw-haw (noun)
a ditch with one side being a retaining wall; used to divide lands without defacing the landscape	a ditch with one side being a retaining wall; used to divide lands without defacing the landscape
a loud laugh that sounds like a horse neighing	a loud laugh that sounds like a horse neighing