The term MORTGAGE SOURCE can be solved with the 6 letter word LENDER. A LENDER is a financial institution that provides funds to borrowers in exchange for repayment of the loan plus interest. Lenders can include banks, credit unions, and other financial institutions. Mortgages are a type of loan that is secured by real estate and typically used to purchase a home. The LENDER is the source of the mortgage and is responsible for providing the funds to the borrower.