hypothesis vs hypothesize

hypothesis is a noun but hypothesize is not a noun.

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

hypothesis (noun)	hypothesize (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

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