The term 'Piccolo Cousin' refers to a type of FLUTE, which is a woodwind instrument. The crossword solutions for this term are 'Fife' (4 letters) and 'FLUTE' (5 letters). A fife is a small, high-pitched FLUTE that is similar to a piccolo, but with a simpler design and fewer keys. It is often used in military bands and marching bands. A FLUTE is a larger, more complex woodwind instrument that is typically used in orchestras and other classical music ensembles.