vocalize

Concise Oxford English Dictionary © 2008 Oxford University Press:
vocalize /ˈvəʊkəlʌɪz/ (or vocalise /ˈvəʊk(ə)lʌɪz/)

▶verb

• 1 utter (a sound or word).

  ■ express in words.

  ■ Music sing with several notes to one vowel.

• 2 Phonetics change (a consonant) to a semivowel or vowel.

• 3 write (a language such as Hebrew) with vowel points.

– derivatives
vocalization noun,
vocalizer noun.