Refrain syllables are a type of lyrical repetition used in songs and poems. The crossword solutions for the term 'refrain syllables' include LAS (3 letters), LALA (4 letters), FALALA (6 letters), TRAS (4 letters), NANANA (6 letters), SHALALA (7 letters), FALA (4 letters), LALAS (5 letters), TRALA (5 letters), TRALAS (6 letters), and TRALALA (7 letters). These syllables are often used to create a catchy chorus or hook in a song.