felicity vs emotional state

felicity and emotional state both are nouns.

Word	Noun	Adjective	Verb	Adverb
felicity	Yes	No	No	No
emotional state	Yes	No	No	No

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

felicity: state of well-being characterized by emotions ranging from contentment to intense joy
emotional state: the state of a person's emotions (especially with regard to pleasure or dejection)

Other hypernyms of felicity include spirit.

felicity (noun)	emotional state (noun)
pleasing and appropriate manner or style (especially manner or style of expression)	the state of a person's emotions (especially with regard to pleasure or dejection)
state of well-being characterized by emotions ranging from contentment to intense joy