elation vs blissfulness

elation and blissfulness both are nouns.

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

As nouns, blissfulness is a hyponym of elation; that is, blissfulness is a word with a more specific, narrower meaning than elation:

elation: an exhilarating psychological state of pride and optimism; an absence of depression
blissfulness: a state of extreme happiness

Other hyponyms of elation include bliss, cloud nine, seventh heaven, walking on air, high, high.

elation (noun)	blissfulness (noun)
a feeling of joy and pride	a state of extreme happiness
an exhilarating psychological state of pride and optimism; an absence of depression