fullness vs surfeit

fullness and surfeit both are nouns.

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

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

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

fullness (noun)	surfeit (noun)
greatness of volume	eating until excessively full
the property of a sensation that is rich and pleasing	the quality of being so overabundant that prices fall
the condition of being filled to capacity	the state of being more than full
completeness over a broad scope

fullness (verb)	surfeit (verb)
	indulge (one's appetite) to satiety
	supply or feed to surfeit