tint vs mellowness

tint and mellowness both are nouns.

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

As nouns, mellowness is a hyponym of tint; that is, mellowness is a word with a more specific, narrower meaning than tint:

Other hyponyms of tint include richness, tinge, undertone.

tint (noun)	mellowness (noun)
a quality of a given color that differs slightly from another color	the property of a sensation that is rich and pleasing
a just detectable amount	a soft shade of a color
a dye for coloring the hair	geniality, as through the effects of alcohol or marijuana
	a taste (especially of fruit) that is ripe and of full flavor
	a feeling of good humor and sympathy through maturity or intoxication or a relaxed state

tint (verb)	mellowness (verb)
color lightly