ratiocination vs ratiocinate

ratiocination is a noun but ratiocinate is not a noun.

Word	Noun	Adjective	Verb	Adverb
ratiocination	Yes	No	No	No
ratiocinate	No	No	Yes	No

ratiocination (noun)	ratiocinate (noun)
logical and methodical reasoning
the proposition arrived at by logical reasoning (such as the proposition that must follow from the major and minor premises of a syllogism)

ratiocination (verb)	ratiocinate (verb)
	reason methodologically and logically