dewiness vs moistness

dewiness and moistness both are nouns.

Word	Noun	Adjective	Verb	Adverb
dewiness	Yes	No	No	No
moistness	Yes	No	No	No

As nouns, moistness is a hypernym of dewiness; that is, moistness is a word with a broader meaning than dewiness:

dewiness: The state or property of being covered by dew, or bearing droplets of water.
moistness: a slight wetness

Other hypernyms of dewiness include damp, dampness.

dewiness (noun)	moistness (noun)
The state or property of being covered by dew, or bearing droplets of water.	a slight wetness