Pending
The real estate term "pending contract" means that someone has made an offer on the property and the seller has accepted. Typically contingent on a home inspection to the buyers satisfaction and financing. There could also be a home sale contingency which means the seller has an escape clause typically if another buyer comes along.
REO
Real estate owned, or REO, is a term used to describe a class of property owned by a lender—typically a bank, government agency, or government loan insurer—after an unsuccessful sale at a foreclosure auction.