overmuchness vs surfeit

overmuchness and surfeit both are nouns.

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

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

Other hyponyms of overmuchness include excess, nimiety, surplus, surplusage, glut, oversupply, bellyful.

overmuchness (noun)	surfeit (noun)
a quantity that is more than what is appropriate	eating until excessively full
	the quality of being so overabundant that prices fall
	the state of being more than full

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