original vs underived

original is a noun but underived is not a noun.

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

original (noun)	underived (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

original (adjective)	underived (adjective)
being or productive of something fresh and unusual; or being as first made or thought of	not derived; primary or simple
(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