walking on air vs bliss

walking on air and bliss both are nouns.

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

As nouns, walking on air and bliss are synonyms defined as:

Other synonyms of walking on air include blissfulness, cloud nine, seventh heaven.

walking on air (noun)	bliss (noun)
a state of extreme happiness	a state of extreme happiness