excess vs superabundance

excess and superabundance both are nouns.

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

As nouns, superabundance is a hypernym of excess; that is, superabundance is a word with a broader meaning than excess:

Other hypernyms of excess include overabundance, overmuch, overmuchness.

excess (noun)	superabundance (noun)
excessive indulgence	a quantity that is more than what is appropriate
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)	superabundance (adjective)
more than is needed, desired, or required