postulate vs premiss

postulate and premiss both are nouns.

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

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

postulate: (logic) a proposition that is accepted as true in order to provide a basis for logical reasoning
premiss: a statement that is assumed to be true and from which a conclusion can be drawn

Other hyponyms of postulate include Bayes' postulate, assumption, premise.

postulate (noun)	premiss (noun)
(logic) a proposition that is accepted as true in order to provide a basis for logical reasoning	a statement that is assumed to be true and from which a conclusion can be drawn

postulate (verb)	premiss (verb)
take as a given; assume as a postulate or axiom	take something as preexisting and given
maintain or assert
require as useful, just, or proper