General term(male/female) =Chicken Adult female chicken =Hen Adult male chicken =Rooster/Cock Baby chicken (male/female)=Chick Young female chicken =Pullet Young male chicken=Cockerel "I ate hen on Thanksgiving."=specifically stating the type of chicken that I ate. "I ate chicken on Thanksgiving. "=using the general term. The person doesn't know the specific type that I ate.

rooster: male , you can also use cock, but it has another meaning, which sometimes leads to a misunderstand hen: female chicken: child hen or rooster, it is the meat of rooster or hen as well