The term 'chorus syllables' refers to a type of vocalization used in music, often as part of a chorus or refrain. The crossword solutions for this term are LAS (3 letters), TRAS (4 letters), TRA (3 letters), LALA (4 letters), TRALA (5 letters), LALALA (6 letters), NANANA (6 letters), and TRALALA (7 letters). These syllables are often repeated in a song to create a catchy and memorable chorus.