The crossword solutions for the term FOOT, SAY are UNIT, which is a four letter word. UNIT is a term used to describe a single thing or entity, such as a single foot. It can also be used to refer to a group of things that are considered to be a single entity, such as a UNIT of measurement. In this context, UNIT could be used to refer to a foot, which is a UNIT of length in the Imperial and US customary systems of measurement.