gainsay vs question

gainsay is not a noun while question is a noun.

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

gainsay (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

gainsay (verb)	question (verb)
take exception to	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