excogitate vs devise

excogitate is not a noun while devise is a noun.

Word	Noun	Adjective	Verb	Adverb
excogitate	No	No	Yes	No
devise	Yes	No	Yes	No

As verbs, excogitate and devise are synonyms defined as:

excogitate and devise: come up with (an idea, plan, explanation, theory, or principle) after a mental effort

Other synonyms of excogitate include contrive, forge, formulate, invent.

excogitate (noun)	devise (noun)
	(law) a gift of real property by will
	a will disposing of real property

excogitate (verb)	devise (verb)
reflect deeply on a subject	come up with (an idea, plan, explanation, theory, or principle) after a mental effort
come up with (an idea, plan, explanation, theory, or principle) after a mental effort	arrange by systematic planning and united effort
	give by will, especially real property