fever pitch vs excitement

fever pitch and excitement both are nouns.

Word	Noun	Adjective	Verb	Adverb
fever pitch	Yes	No	No	No
excitement	Yes	No	No	No

As nouns, excitement is a hypernym of fever pitch; that is, excitement is a word with a broader meaning than fever pitch:

Other hypernyms of fever pitch include excitation, fervor, fervour, inflammation.

fever pitch (noun)	excitement (noun)
a state of extreme excitement	something that agitates and arouses
	disturbance usually in protest
	the feeling of lively and cheerful joy
	the state of being emotionally aroused and worked up