proposal vs question

proposal and question both are nouns.

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

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

proposal: something proposed (such as a plan or assumption)
question: a formal proposal for action made to a deliberative assembly for discussion and vote

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

proposal (noun)	question (noun)
something proposed (such as a plan or assumption)	uncertainty about the truth or factuality or existence of something
the act of making a proposal	an instance of questioning
an offer of marriage	the subject matter at issue
	a formal proposal for action made to a deliberative assembly for discussion and vote
	a sentence of inquiry that asks for a reply
	an informal reference to a marriage proposal

proposal (verb)	question (verb)
	pose a question
	challenge the accuracy, probity, or propriety of
	place in doubt or express doubtful speculation
	pose a series of questions to
	conduct an interview in television, newspaper, and radio reporting