Broiler refers to pretty much any young chicken (6 to 10 weeks old) that is raised for its meat. There's no difference between a fryer and a broiler, and sometimes they're labeled "broiler-fryer." According to the USDA, a fryer chicken is between 7 and 10 weeks old and weighs between 2 1/2 and 4 1/2 pounds when processed.  A roaster, on the other hand, is an older chicken, about 3 to 5 months old and 5 and 7 pounds. As you can guess, you'll get more meat from a roaster.