vocalize vs quaver

vocalize is not a noun while quaver is a noun.

Word	Noun	Adjective	Verb	Adverb
vocalize	No	No	Yes	No
quaver	Yes	No	Yes	No

As verbs, quaver is a hyponym of vocalize; that is, quaver is a word with a more specific, narrower meaning than vocalize:

Other hyponyms of vocalize include chirk, waver.

vocalize (noun)	quaver (noun)
	a musical note having the time value of an eighth of a whole note
	a tremulous sound

vocalize (verb)	quaver (verb)
pronounce as a vowel	sing or play with trills, alternating with the half note above or below
express or state clearly	give off unsteady sounds, alternating in amplitude or frequency
utter with vibrating vocal chords
utter speech sounds
sing (each note a scale or in a melody) with the same vowel