The relevant word here is "Prison", the French noun. https://en.wikipedia.org/wiki/La_Sant%C3%A9_Prison https://en.wikipedia.org/wiki/La_Sant%C3%A9_Prison The

The relevant word here is "Prison", the French noun. https://en.wikipedia.org/wiki/La_Sant%C3%A9_Prison https://en.wikipedia.org/wiki/La_Sant%C3%A9_Prison The BBC article is using the two terms interchangably. Very few readers are concerned about the distinction you are making.