coyness vs demureness

coyness and demureness both are nouns.

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

As nouns, coyness and demureness are synonyms defined as:

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

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