haw-haw vs ha-ha

haw-haw and ha-ha both are nouns.

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

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

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

Other synonyms of haw-haw include sunk fence.

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

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

haw-haw (noun)	ha-ha (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