underivative vs original

underivative is not a noun while original is a noun.

Word	Noun	Adjective	Verb	Adverb
underivative	No	Yes	No	No
original	Yes	Yes	No	No

underivative (noun)	original (noun)
	an original creation (i.e., an audio recording) from which copies can be made
	something that serves as a model or a basis for making copies

underivative (adjective)	original (adjective)
not derivative or imitative	being or productive of something fresh and unusual; or being as first made or thought of
	(of e.g. information) not secondhand or by way of something intermediary
	not derived or copied or translated from something else
	preceding all others in time or being as first made or performed