vocalize vs vowelise

vocalize and vowelise both are verbs.

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

As verbs, vocalize and vowelise are synonyms defined as:

Other synonyms of vocalize include vocalise, vowelize.

vocalize (verb)	vowelise (verb)
pronounce as a vowel	pronounce as a vowel
express or state clearly
utter with vibrating vocal chords
utter speech sounds
sing (each note a scale or in a melody) with the same vowel