question vs check out

question is a noun but check out is not a noun.

Word	Noun	Adjective	Verb	Adverb
question	Yes	No	Yes	No
check out	No	No	Yes	No

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

Other hyponyms of question include enquire, inquire, wonder, interpellate, examine, pump, feel out, sound out, debrief.

question (noun)	check out (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

question (verb)	check out (verb)
pose a question	examine so as to determine accuracy, quality, or condition
challenge the accuracy, probity, or propriety of	announce one's departure from a hotel
place in doubt or express doubtful speculation	try to learn someone's opinions and intentions
pose a series of questions to	record, add up, and receive payment for items purchased
conduct an interview in television, newspaper, and radio reporting	withdraw money by writing a check
	trace
	be verified or confirmed; pass inspection