Comment by rerdavies

Excellent! And even stranger. In French, the singular and plural forms have the same pronunciation! Damned Rosbif can't do ANYTHING right. lol.

The Artificial General Intelligence (Claude) gives a few more examples (but only after having been prompted with your examples):

- Rendezvous, hors d'eouvre, patois, chamois, bourgeois, glacis, fracas (dialect dependent), debris (rare), pince nez (dialect dependent).