underpayment vs payment

underpayment and payment both are nouns.

Word	Noun	Adjective	Verb	Adverb
underpayment	Yes	No	No	No
payment	Yes	No	No	No

As nouns, payment is a hypernym of underpayment; that is, payment is a word with a broader meaning than underpayment:

Other hypernyms of underpayment include defrayal, defrayment.

As nouns, payment is a hypernym of underpayment; that is, payment is a word with a broader meaning than underpayment:

underpayment (noun)	payment (noun)
the act of paying less than required	the act of paying money
a payment smaller than needed or expected	an act of requiting; returning in kind
	a sum of money paid or a claim discharged