The term 'lowest part' can be described by a variety of words, each with four to six letters. The word 'FOOT' (4 letters) refers to the BOTTOM of the body, while 'BASSO' (5 letters) is an Italian musical term for a low-pitched voice or instrument. 'BOTTOM' (6 letters) is a synonym for the lowest part of something, and 'DEPTHS' (6 letters) is a metaphor for the lowest point. 'NADIR' (5 letters) is an astronomical term for the point on the celestial sphere directly below an observer, and 'BASS' (4 letters) and 'BASE' (4 letters) both refer to the lowest part of something.