excess vs superfluous

excess is a noun but superfluous is not a noun.

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

As adjectives, excess and superfluous are synonyms defined as:

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

excess (noun)	superfluous (noun)
excessive indulgence
immoderation as a consequence of going beyond sufficient or permitted limits
a quantity much larger than is needed
the state of being more than full

excess (adjective)	superfluous (adjective)
more than is needed, desired, or required	more than is needed, desired, or required
	serving no useful purpose; having no excuse for being