supererogatory vs redundant

supererogatory and redundant both are adjectives.

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

As adjectives, supererogatory and redundant are synonyms defined as:

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

supererogatory (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