Mule and Pye-dog

Mule noun - Hybrid offspring of a male donkey and a female horse; usually sterile.

Pye-dog and mule are semantically related. In some cases you can use "Pye-dog" instead a noun "Mule".

Pye-dog noun - Ownerless half-wild mongrel dog common around Asian villages especially India.

Mule and pye-dog are semantically related. You can use "Mule" instead a noun phrase "Pye-dog".