chew over vs question

chew over is not a noun while question is a noun.

Word	Noun	Adjective	Verb	Adverb
chew over	No	No	Yes	No
question	Yes	No	Yes	No

As verbs, question is a hyponym of chew over; that is, question is a word with a more specific, narrower meaning than chew over:

Other hyponyms of chew over include premeditate, theologise, theologize, introspect, bethink, cogitate, wonder, puzzle, consider, study.

chew over (noun)	question (noun)
	uncertainty about the truth or factuality or existence of something
	an instance of questioning
	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

chew over (verb)	question (verb)
reflect deeply on a subject	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