theorize vs reason

theorize is not a noun while reason is a noun.

Word	Noun	Adjective	Verb	Adverb
theorize	No	No	Yes	No
reason	Yes	No	Yes	No

As verbs, reason is a hypernym of theorize; that is, reason is a word with a broader meaning than theorize:

As verbs, reason is a hypernym of theorize; that is, reason is a word with a broader meaning than theorize:

theorize (noun)	reason (noun)
	the capacity for rational thought or inference or discrimination
	a fact that logically justifies some premise or conclusion
	a justification for something existing or happening
	an explanation of the cause of some phenomenon
	a rational motive for a belief or action
	the state of having good sense and sound judgment

theorize (verb)	reason (verb)
to believe especially on uncertain or tentative grounds	think logically
form or construct theories	decide by reasoning; draw or come to a conclusion
construct a theory about	present reasons and arguments