cash vs immediate payment

cash and immediate payment both are nouns.

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

As nouns, cash and immediate payment are synonyms defined as:

cash and immediate payment: prompt payment for goods or services in currency or by check

cash (noun)	immediate payment (noun)
money in the form of bills or coins	prompt payment for goods or services in currency or by check
prompt payment for goods or services in currency or by check

cash (verb)	immediate payment (verb)
exchange for cash