Here's a breakdown of terms for mature cattle:
* Cow: A female cattle that has given birth at least once.
* Bull: A male cattle that is sexually mature and used for breeding.
* Steer: A castrated male cattle.
* Heifer: A female cattle that has not yet given birth.
The term "cow" is often used generally to refer to any adult cattle, regardless of sex, although it's more accurate to refer to females as cows.