String instruments are a type of musical instrument that produce sound by vibrating strings. The crossword solutions for string instruments include cellos (6 letters), viols (5 letters), ukes (4 letters), lutes (5 letters), violas (6 letters), VIOL (4 letters), celli (5 letters), and banjos (6 letters). Cellos, viols, violas, and viols are all members of the violin family, while ukes, lutes, and banjos are fretted string instruments. Celli is an alternate spelling of cellos.