The term 'waterfront site' can be broken down into two crossword solutions: QUAY (4 letters) and PIER (4 letters). A QUAY is a structure built along the shore of a body of water, typically made of stone or concrete, and used for docking ships. A PIER is a raised platform extending out from the shore over the water, usually supported by piles or pillars, and used for recreation or commerce. Both quays and piers are commonly found in waterfront sites.