solmization vs vocalizing

solmization and vocalizing both are nouns.

Word	Noun	Adjective	Verb	Adverb
solmization	Yes	No	No	No
vocalizing	Yes	No	No	No

As nouns, vocalizing is a hypernym of solmization; that is, vocalizing is a word with a broader meaning than solmization:

solmization: singing using solfa syllables to denote the notes of the scale of C major
vocalizing: the act of singing vocal music

Other hypernyms of solmization include singing.

solmization (noun)	vocalizing (noun)
singing using solfa syllables to denote the notes of the scale of C major	the act of singing vocal music
a system of naming the notes of a musical scale by syllables instead of letters