croak vs utterance

croak and utterance both are nouns.

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

As nouns, utterance is a hypernym of croak; that is, utterance is a word with a broader meaning than croak:

Other hypernyms of croak include vocalization.

croak (noun)	utterance (noun)
a harsh hoarse utterance (as of a frog)	the use of uttered sounds for auditory communication

croak (verb)	utterance (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