plainness vs homeliness

plainness and homeliness both are nouns.

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

As nouns, plainness and homeliness are synonyms defined as:

plainness and homeliness: an appearance that is not attractive or beautiful

plainness (noun)	homeliness (noun)
the appearance of being plain and unpretentious	an appearance that is not attractive or beautiful
an appearance that is not attractive or beautiful	having a drab or dowdy quality; lacking stylishness or elegance
clarity as a consequence of being perspicuous
the state of being unmixed with other material