devise vs invent

devise is a noun but invent is not a noun.

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

As verbs, devise and invent are synonyms defined as:

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

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

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

devise (verb)	invent (verb)
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	concoct something artificial or untrue
give by will, especially real property