croak vs starve

croak is a noun but starve is not a noun.

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

As verbs, starve is a hyponym of croak; that is, starve 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
starve: die of food deprivation

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

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

croak (verb)	starve (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	have a craving, appetite, or great desire for
utter a hoarse sound, like a raven	die of food deprivation
	deprive of food
	deprive of a necessity and cause suffering