cloud nine vs elation

cloud nine and elation both are nouns.

Word	Noun	Adjective	Verb	Adverb
cloud nine	Yes	No	No	No
elation	Yes	No	No	No

As nouns, elation is a hypernym of cloud nine; that is, elation is a word with a broader meaning than cloud nine:

cloud nine: a state of extreme happiness
elation: an exhilarating psychological state of pride and optimism; an absence of depression

cloud nine (noun)	elation (noun)
a state of extreme happiness	a feeling of joy and pride
	an exhilarating psychological state of pride and optimism; an absence of depression