excess vs supernumerary

excess and supernumerary both are nouns.

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

As adjectives, excess and supernumerary are synonyms defined as:

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

excess (noun)	supernumerary (noun)
excessive indulgence	a minor actor in crowd scenes
immoderation as a consequence of going beyond sufficient or permitted limits	a person serving no apparent function
a quantity much larger than is needed
the state of being more than full

excess (adjective)	supernumerary (adjective)
more than is needed, desired, or required	more than is needed, desired, or required