WORD and marked option:Cove- a small SHELTERED bayBay- a broad INLET of the sea where the land curves inwardLet's look at the meanings of the other given options: Hollow- having a hole or empty space insidePit- a large hole in the groundCrater- a large pit or hollow forming the mouth of a volcanoHence from the given meanings, we FIND that Cove and Bay are synonyms.