sidesplitter vs howler

sidesplitter and howler both are nouns.

Word	Noun	Adjective	Verb	Adverb
sidesplitter	Yes	No	No	No
howler	Yes	No	No	No

As nouns, sidesplitter and howler are synonyms defined as:

Other synonyms of sidesplitter include belly laugh, riot, scream, thigh-slapper, wow.

sidesplitter (noun)	howler (noun)
a joke that seems extremely funny	a glaring blunder
	monkey of tropical South American forests having a loud howling cry
	a joke that seems extremely funny