immediate payment vs payment

immediate payment and payment both are nouns.

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

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

immediate payment: prompt payment for goods or services in currency or by check
payment: a sum of money paid or a claim discharged

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