ecstasy vs blissfulness

ecstasy and blissfulness both are nouns.

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

As nouns, blissfulness is a hypernym of ecstasy; that is, blissfulness is a word with a broader meaning than ecstasy:

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

ecstasy (noun)	blissfulness (noun)
street names for methylenedioxymethamphetamine	a state of extreme happiness
a state of being carried away by overwhelming emotion
a state of elated bliss