hypothesis vs proposal

hypothesis and proposal both are nouns.

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

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

hypothesis (noun)	proposal (noun)
a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena	something proposed (such as a plan or assumption)
a proposal intended to explain certain facts or observations	the act of making a proposal
a message expressing an opinion based on incomplete evidence	an offer of marriage