The term PART OF A FLUTE can be solved by the crossword solution STEM, which is a four letter word. The STEM of a flute is the main body of the instrument, and is usually made of metal or wood. It is the part of the flute that connects the head joint to the foot joint, and is where the keys are located. The STEM also houses the air column, which is responsible for producing sound when the player blows into the mouthpiece.