bliss vs walking on air

bliss and walking on air both are nouns.

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

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

Other synonyms of bliss include blissfulness, cloud nine, seventh heaven.

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