Sibilant sounds are a type of consonant sound that is produced by forcing air through a narrow channel in the mouth, resulting in a hissing or whistling sound. The crossword solutions for this term are esses (5 letters), fizzles (7 letters), psts (4 letters), and pssts (5 letters). Esses are a type of sibilant sound that is made by placing the tongue against the back of the upper teeth and exhaling sharply. Fizzles are another type of sibilant sound that is made by placing the tongue against the roof of the mouth and exhaling sharply. Psts and pssts are similar to esses and fizzles, but they are made with a softer exhalation.