excess vs extra

excess and extra both are nouns.

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

As adjectives, excess and extra are synonyms defined as:

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

excess (noun)	extra (noun)
excessive indulgence	something additional of the same kind
immoderation as a consequence of going beyond sufficient or permitted limits	an additional edition of a newspaper (usually to report a crisis)
a quantity much larger than is needed	a minor actor in crowd scenes
the state of being more than full

excess (adjective)	extra (adjective)
more than is needed, desired, or required	further or added
	more than is needed, desired, or required
	added to a regular schedule

excess (adverb)	extra (adverb)
	unusually or exceptionally