supposition vs supposal

supposition and supposal both are nouns.

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

As nouns, supposition and supposal are synonyms defined as:

Other synonyms of supposition include assumption.

As nouns, supposition and supposal are synonyms defined as:

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