The term 'FOOT PREDECESSORS' can be solved by the 6-letter word 'CUBITS'. A cubit is an ancient unit of length, typically about 18 inches, used in many different cultures. It was used in the ancient Near East and Egypt for measuring length, and is still used today in some parts of the world. The term 'foot predecessors' refers to the fact that the cubit was used as a unit of measurement before the foot became the standard unit of length.