hypothesize vs hypothesis

hypothesize is not a noun while hypothesis is a noun.

Word	Noun	Adjective	Verb	Adverb
hypothesize	No	No	Yes	No
hypothesis	Yes	No	No	No

hypothesize (noun)	hypothesis (noun)
	a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
	a proposal intended to explain certain facts or observations
	a message expressing an opinion based on incomplete evidence

hypothesize (verb)	hypothesis (verb)
to believe especially on uncertain or tentative grounds