bellyful vs overmuchness

bellyful and overmuchness both are nouns.

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

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

Other hypernyms of bellyful include overabundance, overmuch, superabundance.

bellyful (noun)	overmuchness (noun)
an undesirable overabundance	a quantity that is more than what is appropriate