"Cock-a-doodle-do" is a distinctive morning crowing sound made by roosters. A few synonyms for this amusing phrase include "cockadoodledoo," "cockadoodle," "cock-a-doodle," and "cock-a-doodle-doo." These variations are commonly used to imitate the sound that roosters make. Other related words include "crow," "cackle," "cluck," and "squawk." These terms aren't quite as specific as "cock-a-doodle-do," but they help to better represent animal noises within the context of a story or poem. Whatever your preference, all of these words share a sense of lightheartedness and fun that truly embodies the playful, noisy nature of roosters.