croak vs croaker

croak and croaker both are nouns.

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

croak (noun)	croaker (noun)
a harsh hoarse utterance (as of a frog)	any of several fishes that make a croaking noise
	the lean flesh of a saltwater fish caught along Atlantic coast of southern U.S.

croak (verb)	croaker (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
utter a hoarse sound, like a raven