premise vs premiss

premise and premiss both are nouns.

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

As nouns, premise and premiss are synonyms defined as:

premise and premiss: a statement that is assumed to be true and from which a conclusion can be drawn

Other synonyms of premise include assumption.

As verbs, premise and premiss are synonyms defined as:

premise (noun)	premiss (noun)
a statement that is assumed to be true and from which a conclusion can be drawn	a statement that is assumed to be true and from which a conclusion can be drawn

premise (verb)	premiss (verb)
take something as preexisting and given	take something as preexisting and given
set forth beforehand, often as an explanation
furnish with a preface or introduction