What is the term for a female chicken that is more than 10 months old?

The term for a female chicken that is more than 10 months old is "hen." In poultry terminology, a hen refers specifically to a mature female chicken that has reached adulthood and is typically capable of laying eggs. This term is widely used in agriculture and culinary contexts to differentiate mature chickens from younger ones, who have different classifications based on their age and developmental stage.

The other terms represent different stages or types of chickens. A broiler is a chicken raised specifically for meat production, usually harvested at a young age, while a fryer refers to a young chicken, typically around 10 weeks old, that is also intended for meat production. A pullet, on the other hand, is a young female chicken that is less than one year old and has not yet begun laying eggs. Therefore, in identifying a female chicken over 10 months old, "hen" is the correct terminology.