The crossword solutions for the term 'Builder Mound' are ERA (3 letters) and PITCH (5 letters). Builder Mound is a type of archaeological site found in the United States. It is characterized by a low, circular mound of earth that was built by Native Americans during the Archaic period. The mound was used as a platform for dwellings and other structures. ERA refers to the time period in which the mound was constructed, while PITCH refers to the material used to construct the mound, which was typically a mixture of clay and grass.