A compound word is a word that is formed by combining two or more other words. In the case of "peacock," the two words that have been combined are "pea" and "cock." The word "pea" refers to the small, round, green legume that is often eaten as a vegetable, while the word "cock" refers to a male bird.
When the two words "pea" and "cock" are combined, the resulting word "peacock" refers to a large, colorful bird that is native to India and Southeast Asia. Peacocks are known for their long, tail feathers that can be spread into a fan-like display.