felicity vs appropriateness

felicity and appropriateness both are nouns.

Word	Noun	Adjective	Verb	Adverb
felicity	Yes	No	No	No
appropriateness	Yes	No	No	No

As nouns, appropriateness is a hypernym of felicity; that is, appropriateness is a word with a broader meaning than felicity:

felicity: pleasing and appropriate manner or style (especially manner or style of expression)
appropriateness: the quality of being specially suitable

felicity (noun)	appropriateness (noun)
pleasing and appropriate manner or style (especially manner or style of expression)	the quality of being specially suitable
state of well-being characterized by emotions ranging from contentment to intense joy	appropriate conduct; doing the right thing