Synonyms for cash

Most common

1. Hard currency

hard currency, cold hard cash, hard cash

2. Money

Other

cash-in

n. 1
Money in the form of notes or bills and coins, as opposed to checks, credit or electronic transactions.
How are you off for cash? After you bounced those checks last time, they want to be paid in cash.
n. 2
Liquid assets, money that can be traded quickly, as distinct from assets that are invested and cannot be easily exchanged.

Word family: cash-in cashless cash-starved cash-strapped
Phrases: cash-in cash machine petty cash cash dispenser cash cow hard cash cold cash cold hard cash

Cash, Specie or Money?

Cash is specie or money in hand, or paid in hand; as, the cash account; the cash price.

J. C. Fernald, English Synonyms and Antonyms (1914)

Word	1850 → 2019	Trend
cash		steady
money		steady

Use in printed books, per decade from 1850 to 2019.

The small number after each word is its number of syllables (money² = 2 syllables).