vocalization vs utterance

vocalization and utterance both are nouns.

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

As nouns, vocalization and utterance are synonyms defined as:

vocalization and utterance: the use of uttered sounds for auditory communication

vocalization (noun)	utterance (noun)
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
the use of uttered sounds for auditory communication