howl vs howler

howl and howler both are nouns.

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

howl (noun)	howler (noun)
a long loud emotional utterance	a glaring blunder
a loud sustained noise resembling the cry of a hound	monkey of tropical South American forests having a loud howling cry
the long plaintive cry of a hound or a wolf	a joke that seems extremely funny

howl (verb)	howler (verb)
laugh unrestrainedly and heartily
make a loud noise, as of wind, water, or vehicles
emit long loud cries
cry loudly, as of animals