cash vs payment

cash and payment both are nouns.

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

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

cash (noun)	payment (noun)
money in the form of bills or coins	the act of paying money
prompt payment for goods or services in currency or by check	an act of requiting; returning in kind
	a sum of money paid or a claim discharged

cash (verb)	payment (verb)
exchange for cash