vocalise vs chirk

vocalise and chirk both are verbs.

Word	Noun	Adjective	Verb	Adverb
vocalise	No	No	Yes	No
chirk	No	No	Yes	No

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

vocalise: utter with vibrating vocal chords
chirk: make a shrill creaking, squeaking, or noise, as of a door, mouse, or bird

Other hyponyms of vocalise include quaver, waver.

vocalise (verb)	chirk (verb)
pronounce as a vowel	make a shrill creaking, squeaking, or noise, as of a door, mouse, or bird
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