solfege vs solmization

solfege and solmization both are nouns.

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

As nouns, solfege and solmization are synonyms defined as:

solfege and solmization: singing using solfa syllables to denote the notes of the scale of C major

Other synonyms of solfege include solfeggio.

solfege (noun)	solmization (noun)
a voice exercise; singing scales or runs to the same syllable	singing using solfa syllables to denote the notes of the scale of C major
singing using solfa syllables to denote the notes of the scale of C major	a system of naming the notes of a musical scale by syllables instead of letters