demureness vs coyness

demureness and coyness both are nouns.

Word	Noun	Adjective	Verb	Adverb
demureness	Yes	No	No	No
coyness	Yes	No	No	No

As nouns, demureness and coyness are synonyms defined as:

demureness and coyness: the affectation of being demure in a provocative way

demureness (noun)	coyness (noun)
the trait of behaving with reserve and decorum	the affectation of being demure in a provocative way
the affectation of being demure in a provocative way