A sibilant sound is a type of consonant sound that is produced by forcing air through a narrow channel in the mouth, creating a HISSING or whistling noise. The crossword solutions for the term sibilant sound are WHISH (5 letters), HISS (4 letters), ESS (3 letters), HISSING (7 letters), SSS (3 letters), SISS (4 letters), and SSST (4 letters). These words all describe the same type of sound, which is a high-pitched, HISSING noise.