* Stallion: This refers to a male horse that has not been castrated. It is a term for the sex of the horse. All male horses are either stallions or geldings (castrated males).
* Clydesdale: This is a specific breed of horse, known for their size, strength, and distinctive feathering on their lower legs.
To put it simply:
* A stallion can be any breed of horse, including a Clydesdale.
* A Clydesdale can be either a stallion, a mare (female) or a gelding.
So, a Clydesdale stallion is a male Clydesdale horse that has not been castrated.