croak vs gnarl

croak and gnarl both are nouns.

Word	Noun	Adjective	Verb	Adverb
croak	Yes	No	Yes	No
gnarl	Yes	No	Yes	No

As verbs, croak and gnarl are synonyms defined as:

Other synonyms of croak include grumble, murmur, mutter.

croak (noun)	gnarl (noun)
a harsh hoarse utterance (as of a frog)	something twisted and tight and swollen

croak (verb)	gnarl (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	make complaining remarks or noises under one's breath
make complaining remarks or noises under one's breath	twist into a state of deformity
utter a hoarse sound, like a raven