rapture vs walking on air

rapture and walking on air both are nouns.

Word	Noun	Adjective	Verb	Adverb
rapture	Yes	No	No	No
walking on air	Yes	No	No	No

As nouns, walking on air is a hypernym of rapture; that is, walking on air is a word with a broader meaning than rapture:

Other hypernyms of rapture include bliss, blissfulness, cloud nine, seventh heaven.

rapture (noun)	walking on air (noun)
a state of being carried away by overwhelming emotion	a state of extreme happiness
a state of elated bliss