The crossword solution for the term 'QUILLS SUBJECT' is SADE, which is a four letter word. SADE is the stage name of Nigerian-born British singer, songwriter, and record producer Helen Folasade Adu. She is known for her soulful voice and her blend of R&B, jazz, and soft rock music. Her debut album, Diamond Life, was released in 1984 and was an instant success. She has since released seven studio albums and has won numerous awards, including two Grammy Awards.