conjecture vs supposal

conjecture and supposal both are nouns.

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

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

conjecture: reasoning that involves the formation of conclusions from incomplete evidence
supposal: the cognitive process of supposing

Other hyponyms of conjecture include theorisation, theorization, supposition.

conjecture (noun)	supposal (noun)
a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence)	a hypothesis that is taken for granted
reasoning that involves the formation of conclusions from incomplete evidence	the cognitive process of supposing
a message expressing an opinion based on incomplete evidence

conjecture (verb)	supposal (verb)
to believe especially on uncertain or tentative grounds