ecstasy vs bliss

ecstasy and bliss both are nouns.

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

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

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

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