fullness vs excess

fullness and excess both are nouns.

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

As nouns, excess is a hyponym of fullness; that is, excess is a word with a more specific, narrower meaning than fullness:

Other hyponyms of fullness include repletion, satiation, satiety, overabundance, surfeit, solidity, infestation.

fullness (noun)	excess (noun)
greatness of volume	excessive indulgence
the property of a sensation that is rich and pleasing	immoderation as a consequence of going beyond sufficient or permitted limits
the condition of being filled to capacity	a quantity much larger than is needed
completeness over a broad scope	the state of being more than full

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