croak vs famish

croak is a noun but famish is not a noun.

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

As verbs, famish is a hyponym of croak; that is, famish is a word with a more specific, narrower meaning than croak:

croak: pass from physical life and lose all bodily attributes and functions necessary to sustain life
famish: die of food deprivation

Other hyponyms of croak include abort, asphyxiate, stifle, suffocate, buy it, pip out, drown, predecease, starve, fall, succumb, yield.

croak (noun)	famish (noun)
a harsh hoarse utterance (as of a frog)

croak (verb)	famish (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	be hungry; go without food
make complaining remarks or noises under one's breath	die of food deprivation
utter a hoarse sound, like a raven	deprive of food