redundant vs supernumerary

redundant is not a noun while supernumerary is a noun.

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

As adjectives, redundant and supernumerary are synonyms defined as:

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

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

redundant (adjective)	supernumerary (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