conception vs conceptional

conception is a noun but conceptional is not a noun.

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

conception (noun)	conceptional (noun)
the act of becoming pregnant; fertilization of an ovum by a spermatozoon
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

conception (adjective)	conceptional (adjective)
	being of the nature of a notion or concept