croak vs change state

croak is a noun but change state is not a noun.

Word	Noun	Adjective	Verb	Adverb
croak	Yes	No	Yes	No
change state	No	No	Yes	No

As verbs, change state is a hypernym of croak; that is, change state is a word with a broader meaning than croak:

croak: pass from physical life and lose all bodily attributes and functions necessary to sustain life
change state: undergo a transformation or a change of position or action

Other hypernyms of croak include turn.

croak (noun)	change state (noun)
a harsh hoarse utterance (as of a frog)

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