suppose vs supposition

suppose is not a noun while supposition is a noun.

Word	Noun	Adjective	Verb	Adverb
suppose	No	No	Yes	No
supposition	Yes	No	No	No

suppose (noun)	supposition (noun)
	a hypothesis that is taken for granted
	the cognitive process of supposing
	a message expressing an opinion based on incomplete evidence

suppose (verb)	supposition (verb)
expect, believe, or suppose
to believe especially on uncertain or tentative grounds
require as a necessary antecedent or precondition
take for granted or as a given; suppose beforehand
express a supposition