conception vs excogitation

conception and excogitation both are nouns.

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

As nouns, conception and excogitation are synonyms defined as:

Other synonyms of conception include design, innovation, invention.

conception (noun)	excogitation (noun)
the act of becoming pregnant; fertilization of an ovum by a spermatozoon	thinking something out with care in order to achieve complete understanding of it
an abstract or general idea inferred or derived from specific instances	the creation of something in the mind
the creation of something in the mind
the event that occurred at the beginning of something