blissfulness vs ecstasy

blissfulness and ecstasy both are nouns.

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

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

Other hyponyms of blissfulness include rapture.

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