ecstasy vs walking on air

ecstasy and walking on air both are nouns.

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

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

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

ecstasy (noun)	walking on air (noun)
street names for methylenedioxymethamphetamine	a state of extreme happiness
a state of being carried away by overwhelming emotion
a state of elated bliss