bliss vs blissfulness

bliss and blissfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
bliss	Yes	No	No	No
blissfulness	Yes	No	No	No

As nouns, bliss and blissfulness are synonyms defined as:

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

bliss (noun)	blissfulness (noun)
a state of extreme happiness	a state of extreme happiness