devise vs excogitate

devise is a noun but excogitate is not a noun.

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

As verbs, devise and excogitate are synonyms defined as:

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

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

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

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