excogitation vs conception

excogitation and conception both are nouns.

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

As nouns, excogitation and conception are synonyms defined as:

Other synonyms of excogitation include design, innovation, invention.

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