rapture vs seventh heaven

rapture and seventh heaven both are nouns.

Word	Noun	Adjective	Verb	Adverb
rapture	Yes	No	No	No
seventh heaven	Yes	No	No	No

As nouns, seventh heaven is a hypernym of rapture; that is, seventh heaven is a word with a broader meaning than rapture:

Other hypernyms of rapture include bliss, blissfulness, cloud nine, walking on air.

rapture (noun)	seventh heaven (noun)
a state of being carried away by overwhelming emotion	a state of extreme happiness
a state of elated bliss