A rooster, also known as a cockerel, cock or chanticleer

Chanticleer

- Fiction :*A rooster appearing in fables about Reynard The Fox**The Nun's Priest's Tale, a version of Chanticleer and the Fox told in Chaucer's Canterbury Tales**By metonymy, any rooster**A character in the movie Rock-a-Doodle played by Glen Campbell...

, is a male chicken

Chicken

The chicken is a domesticated fowl, a subspecies of the Red Junglefowl. As one of the most common and widespread domestic animals, and with a population of more than 24 billion in 2003, there are more chickens in the world than any other species of bird...

 (Gallus gallus) with the female being called a hen. Immature male chickens of less than a year's age are called cockerels. The oldest term is "cock," from Old English coc. The term "rooster" originates from the United States, while in the United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 and Ireland

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

 the older term "cockerel" is more widely used.