supposition vs hypothesis

supposition and hypothesis both are nouns.

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

As nouns, hypothesis is a hypernym of supposition; that is, hypothesis is a word with a broader meaning than supposition:

supposition: a hypothesis that is taken for granted
hypothesis: a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena

Other hypernyms of supposition include possibility, theory.

As nouns, supposition and hypothesis are synonyms defined as:

supposition and hypothesis: a message expressing an opinion based on incomplete evidence

Other synonyms of supposition include conjecture, guess, speculation, surmisal, surmise.

supposition (noun)	hypothesis (noun)
a hypothesis that is taken for granted	a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
the cognitive process of supposing	a proposal intended to explain certain facts or observations
a message expressing an opinion based on incomplete evidence	a message expressing an opinion based on incomplete evidence