A whistle is a device used to make a loud, high-pitched sound. It can be made of different materials, such as metal, plastic, or wood. The term 'whistle' can also refer to the sound it makes. HISS is a four-letter word meaning to make a long, sibilant sound like that of a snake. PIPE is another four-letter word meaning a tube of metal, wood, or other material used to convey water, gas, steam, or air. SIGH is a four-letter word meaning to make a deep, prolonged sound expressing sorrow, relief, or contentment. SHRIEK is a six-letter word meaning to utter a loud, sharp, shrill cry. FLUTE is a five-letter word meaning a musical instrument consisting of a tube with a series of finger holes and sometimes keys, in which the wind is directed against a sharp edge, either directly or through a flue. TOOT is a four-letter word meaning to BLOW a short, sharp sound on a horn or whistle. BLOW is a four-letter word meaning to produce a current of air by natural or artificial means. TIN is a three-letter word meaning a soft, silvery-white metallic element. All of these words are related to the term 'whistle' in some way.