Ginnie Mae
See Government National Mortgage Association.
Government National Mortgage Association (GNMA)

Graduated Payment Mortgage (GPM)
A type of flexible-payment mortgage where the payments increase for a specified period of time and then level off. This type of mortgage has negative amortization built into it.

Guaranty
A promise by one party to pay a debt or perform an obligation contracted by another if the original party fails to pay or perform according to a contract.