questioning vs question

questioning and question both are nouns.

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

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

Other hyponyms of questioning include challenge, enquiry, inquiry, interrogation, query, examination, interrogation, interrogatory.

questioning (noun)	question (noun)
a request for information	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

questioning (adjective)	question (adjective)
showing curiosity
marked by or given to doubt
perplexed (as if being expected to know something that you do not know)

questioning (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