sweetness vs amenity

sweetness and amenity both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweetness	Yes	No	No	No
amenity	Yes	No	No	No

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

Other hyponyms of sweetness include pleasingness, agreeableness, enjoyableness, niceness.

sweetness (noun)	amenity (noun)
the property of tasting as if it contains sugar	pleasantness resulting from agreeable conditions
a pleasingly sweet olfactory property
the quality of giving pleasure
the taste experience when sugar dissolves in the mouth