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The correct phrases are Mortgage Lending, Mortgage Lender, and Mortgage Lenders.
Edit: You can type "phrase" into google *with* the quotes if you are unsure about an English phrase or ask someone here on namepros. The number of google search results is often irrelevant but in this case, it can sometimes be helpful. Or maybe there are free grammar checking sites out there.
You can ask GoDaddy for a refund.