bareness vs plainness

bareness and plainness both are nouns.

Word	Noun	Adjective	Verb	Adverb
bareness	Yes	No	No	No
plainness	Yes	No	No	No

As nouns, plainness is a hypernym of bareness; that is, plainness is a word with a broader meaning than bareness:

bareness (noun)	plainness (noun)
an extreme lack of furnishings or ornamentation	the appearance of being plain and unpretentious
the state of being unclothed and exposed (especially of a part of the body)	an appearance that is not attractive or beautiful
a bleak and desolate atmosphere	clarity as a consequence of being perspicuous
	the state of being unmixed with other material