Collateral
It is called a note.
promissory note
Collateral
No, you cannot pay back a loan with the same loan money.
What you do with a loan is irrelevant. You always have to pay it back.
Failing to pay back a loan is called defaulting on the loan.
It is probably a good idea to pay back any loan. A loan, by definition, is something being furnished on condition of being returned. If you don't pay it back, it is not a loan. It is stealing.
because a credit card purchase is a loan, a promise to pay back in the future. it does not fall under the definitions of money (m1,2,3)
Yes, it is possible to pay back your 401k loan early.
First: when you borrow money you have to pay it back. Now depending on the local laws it can be a very complex issue. For instance did the employer make an implied promise that the employee wpuld be employed long enough to pay back the loan? Or was it specifically a loan against future paychecks? Your best bet is to see a lawyer to sort out the provable circumstances surrounding the loan and end to employment.
have fair crediit need a loan with time to pay it back?
If you need a loan but can't pay it back, you should not get a loan. You should rethink your 'need' and find another way to resolve it. If you borrow money that you can't pay back, that is a form of theft.