Arruela, virola.
n.A ring or cap of metal put round a cane, tool, handle, or other similar object, to strengthen it, or prevent splitting and wearing. A bushing for expanding the end of a flue to fasten it tightly in the tube plate, or for partly filling up its mouth
n.collet, cap generic term
Vogais: eue
Consoantes: frrl
ferule, ferula, febrile, feral, ferly, ferial, friuli, furile, fabrile, farrell.