intonate vs sing

intonate and sing both are verbs.

Word	Noun	Adjective	Verb	Adverb
intonate	No	No	Yes	No
sing	No	No	Yes	No

As verbs, sing is a hypernym of intonate; that is, sing is a word with a broader meaning than intonate:

intonate (verb)	sing (verb)
recite with musical intonation; recite as a chant or a psalm	make a whining, ringing, or whistling sound
speak carefully, as with rising and falling pitch or in a particular tone	divulge confidential information or secrets
	to make melodious sounds
	produce tones with the voice
	deliver by singing