mellowness vs affableness

mellowness and affableness both are nouns.

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

As nouns, affableness is a hypernym of mellowness; that is, affableness is a word with a broader meaning than mellowness:

mellowness: geniality, as through the effects of alcohol or marijuana
affableness: a disposition to be friendly and approachable (easy to talk to)

Other hypernyms of mellowness include affability, amiability, amiableness, bonhomie, geniality.

mellowness (noun)	affableness (noun)
the property of a sensation that is rich and pleasing	a disposition to be friendly and approachable (easy to talk to)
a soft shade of a color
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