undertone vs tint

undertone and tint both are nouns.

Word	Noun	Adjective	Verb	Adverb
undertone	Yes	No	No	No
tint	Yes	No	Yes	No

As nouns, tint is a hypernym of undertone; that is, tint is a word with a broader meaning than undertone:

Other hypernyms of undertone include shade, tincture, tone.

undertone (noun)	tint (noun)
a pale or subdued color	a quality of a given color that differs slightly from another color
a subdued emotional quality underlying an utterance; implicit meaning	a just detectable amount
a quiet or hushed tone of voice	a dye for coloring the hair

undertone (verb)	tint (verb)
	color lightly