The crossword solutions for the term INSTRUMENT; PLANT are VIOLA (5 letters). The VIOLA is a stringed instrument that is similar to a violin, but slightly larger and with a deeper sound. It is played with a bow and is held between the shoulder and chin. It is part of the violin family and is used in orchestras, chamber music, and as a solo instrument. It is also known as a plant, which is a flowering plant in the violet family.