croak vs vocalization

croak and vocalization both are nouns.

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

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

Other hypernyms of croak include utterance.

croak (noun)	vocalization (noun)
a harsh hoarse utterance (as of a frog)	the sound made by the vibration of vocal folds modified by the resonance of the vocal tract
	the use of uttered sounds for auditory communication

croak (verb)	vocalization (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