surfeit vs overmuchness

surfeit and overmuchness both are nouns.

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

As nouns, overmuchness is a hypernym of surfeit; that is, overmuchness is a word with a broader meaning than surfeit:

Other hypernyms of surfeit include overabundance, overmuch, superabundance.

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

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