The term GIGGLER'S SOUND can be broken down into three crossword solutions: HEE (3 letters), TEHEE (5 letters), and HEEHEE (6 letters). These words are all onomatopoeic, meaning they imitate the sound of laughter. HEE is a short, high-pitched giggle, TEHEE is a slightly longer, more drawn out giggle, and HEEHEE is a longer, more intense giggle. All three words are used to describe the sound of someone laughing.