emotional state vs emotion

emotional state and emotion both are nouns.

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

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

emotional state: the state of a person's emotions (especially with regard to pleasure or dejection)
emotion: any strong feeling

emotional state (noun)	emotion (noun)
the state of a person's emotions (especially with regard to pleasure or dejection)	any strong feeling