presumption vs supposal

presumption and supposal both are nouns.

Word	Noun	Adjective	Verb	Adverb
presumption	Yes	No	No	No
supposal	Yes	No	No	No

As nouns, supposal is a hypernym of presumption; that is, supposal is a word with a broader meaning than presumption:

Other hypernyms of presumption include assumption, supposition.

presumption (noun)	supposal (noun)
a kind of discourtesy in the form of an act of presuming	a hypothesis that is taken for granted
audacious (even arrogant) behavior that you have no right to	the cognitive process of supposing
an assumption that is taken for granted
(law) an inference of the truth of a fact from other facts proved or admitted or judicially noticed