supernumerary vs redundant

supernumerary is a noun but redundant is not a noun.

Word	Noun	Adjective	Verb	Adverb
supernumerary	Yes	Yes	No	No
redundant	No	Yes	No	No

As adjectives, supernumerary and redundant are synonyms defined as:

Other synonyms of supernumerary include excess, extra, spare, supererogatory, superfluous, surplus.

supernumerary (noun)	redundant (noun)
a minor actor in crowd scenes
a person serving no apparent function

supernumerary (adjective)	redundant (adjective)
more than is needed, desired, or required	more than is needed, desired, or required
	repetition of same and identical sense with different and non-identical words