The term FLUTE PART can be solved by the four-letter word STEM. The STEM of a flute is the main body of the instrument, which is typically made of metal or wood. It is cylindrical in shape and has a series of holes along its length. The STEM also houses the keys that are used to produce different notes. The mouthpiece of the flute is attached to the STEM, and the player blows into it to produce sound. The STEM is an essential part of the flute, as it helps to create the desired sound.