vocalization vs speech

vocalization and speech both are nouns.

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

As nouns, speech is a hyponym of vocalization; that is, speech is a word with a more specific, narrower meaning than vocalization:

vocalization (noun)	speech (noun)
the sound made by the vibration of vocal folds modified by the resonance of the vocal tract	the mental faculty or power of vocal communication
the use of uttered sounds for auditory communication	(language) communication by word of mouth
	the act of delivering a formal spoken communication to an audience
	words making up the dialogue of a play
	a lengthy rebuke
	the exchange of spoken words
	your characteristic style or manner of expressing yourself orally
	something spoken