invention vs excogitation

invention and excogitation both are nouns.

Word	Noun	Adjective	Verb	Adverb
invention	Yes	No	No	No
excogitation	Yes	No	No	No

As nouns, invention and excogitation are synonyms defined as:

Other synonyms of invention include conception, design, innovation.

invention (noun)	excogitation (noun)
the act of inventing	thinking something out with care in order to achieve complete understanding of it
a creation (a new device or process) resulting from study and experimentation	the creation of something in the mind
the creation of something in the mind