cash, cache

Cash or cash means money--the green kind with the pictures of Americans of the past on it--
I need to stop at an ATM to get some cash.
We're out of cash, and this store doesn't accept credit cards.
Cash may be used as a verb ( action word ), meaning to present a check to a bank for cash--
He stopped at the bank to cash his paycheck.
Ask the teller if you can cash a check.

Cache or cache ( rhymes with cash ) means to hide in a secret place. Cache also means the secret place in which things are hidden, or the things hidden in the secret place--
He decided to cache the valuables in the chimney.
It took all night to find the cache where they had hidden the loot.
The burglars never found the cache of jewelry hidden under the floor.

Now that you know that, you can say--
"Using the oven as a cache for the cash was a bad idea, they decided, when they heard the smoke alarm."

Note--"cashed" is the past tense of the verb ( action word ) "cash", meaning someone took a check to the bank to redeem it for cash--
I cashed my check on Friday.
"Cached" is the past tense ( yesterday, or some time ago ) of "cache", meaning hidden--
He cached the stuff where no one will find it.

Note # 2--"cashes" is the third person singular ( he, she, it ) form of "cash", meaning to redeem for cash--
He cashes his check on Fridays.
"Caches" may mean the plural ( more than one ) of  "cache", or it may be the he, she, it form of "cache"--
There are several caches of stolen goods in this house.
Or  "caches"  may be the third person singular ( he, she, it )  form of "cache"--
He caches his loot in the floorboards.