Birds are known for their various sounds, which can range from chirps and tweets to trills and cheeps. The term 'BIRD's sound' can refer to any of these five distinct noises, each with its own unique spelling. CHEEP is a short, high-pitched sound made by some birds, such as chickens, and is spelled with five letters. CHIRRUP is a similar sound, but slightly longer and higher in pitch, and is spelled with seven letters. CHIRP is another short, high-pitched sound, but is slightly different than CHEEP and is spelled with five letters. TWEET is a short, high-pitched sound made by some birds, such as sparrows, and is spelled with five letters. Lastly, TRILL is a continuous, high-pitched sound made by some birds, such as warblers, and is spelled with five letters.