ESN

1. Educationally subnormal, formerly used to describe people with special educational needs
2. Electronic serial number, a unique, unchangeable number embedded in a mobile phone to identify it

• rustless
• rustle up
• rustling
• rustlingly
• rustlings
• rustproof
• rustproofing
• rustre
• rustred
• rustres
• rust-resistant
• rusts
• rusty
• rusty-back
• rusty-backs
• rusty-coloured
• rusty nail
• rusty nails
• rusé
• rut
• Ruta
• rutabaga
• rutabagas
• Rutaceae
• rutaceous