excogitate vs invent

excogitate and invent both are verbs.

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

As verbs, excogitate and invent are synonyms defined as:

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

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

excogitate (verb)	invent (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	concoct something artificial or untrue