The term 'make grooves in' can be completed with three different crossword solutions: FLUTE (5 letters), SCORE (5 letters), and FLUTING (7 letters). FLUTING is the process of making grooves in a material, such as wood or metal. FLUTING is often used to create decorative patterns on objects. A FLUTE is a musical instrument that produces sound by blowing air through a tube with holes in it. A SCORE is a written form of music that includes all the parts of a song, such as the melody, harmony, and rhythm.