trenail/ʹtreenayl, ʹtrenl/ noun

• Oriya
• Orlon
• orlop deck
• ormer
• ormolu
• ornament
• ornamental
• ornamentation
• ornate
• ornery
• ornith-
• ornithischian
• ornitho-
• ornithology
• oro-
• orogenesis
• orogeny
• orography
• oropharynx
• orotund
• orphan
• orphanage
• orphic
• Orphism
• orphrey