I have heard, I think from a user on here, that crimes are often listed as a pair of synonyms (e.g. "aiding and abetting") because one word was Norman French and the other was English, and the law required both to be understood.
Beef <- Boeuf
Pork <- Porc
Poultry <- Poulet
Salmon <- Saumon
Venison <- Venaison
Mutton <- Mouton
The latin words are in some cases the root of the French but it's not as clear or consistent.