walking on air vs blissfulness

walking on air and blissfulness both are nouns.

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

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

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

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