The term 'KIND OF FLUTE' can be solved by the crossword solution ALTO, which is a four-letter word. An ALTO flute is a type of flute that is pitched in the key of G and is slightly larger than a standard concert flute. It is also known as a bass flute and is typically used in orchestras and wind ensembles. ALTO flutes are usually made of metal and have a curved head joint, which gives them a unique sound.