theorise vs conjecture

theorise is not a noun while conjecture is a noun.

Word	Noun	Adjective	Verb	Adverb
theorise	No	No	Yes	No
conjecture	Yes	No	Yes	No

As verbs, theorise and conjecture are synonyms defined as:

theorise and conjecture: to believe especially on uncertain or tentative grounds

Other synonyms of theorise include hypothecate, hypothesise, hypothesize, speculate, suppose, theorize.

theorise (noun)	conjecture (noun)
	a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence)
	reasoning that involves the formation of conclusions from incomplete evidence
	a message expressing an opinion based on incomplete evidence

theorise (verb)	conjecture (verb)
to believe especially on uncertain or tentative grounds	to believe especially on uncertain or tentative grounds