scenario vs premiss

scenario and premiss both are nouns.

Word	Noun	Adjective	Verb	Adverb
scenario	Yes	No	No	No
premiss	Yes	No	Yes	No

As nouns, premiss is a hypernym of scenario; that is, premiss is a word with a broader meaning than scenario:

scenario: a postulated sequence of possible events
premiss: a statement that is assumed to be true and from which a conclusion can be drawn

Other hypernyms of scenario include assumption, premise.

scenario (noun)	premiss (noun)
an outline or synopsis of a play (or, by extension, of a literary work)	a statement that is assumed to be true and from which a conclusion can be drawn
a postulated sequence of possible events
a setting for a work of art or literature

scenario (verb)	premiss (verb)
	take something as preexisting and given