NT

1. National Theatre (now known as RNT)
2. National Trust
3. New Testament
4. Northern Territory (Aust)
5. Northwest Territories (of Canada)
6. No trumps (cards)

-n't shortened (enclitic) form of not¹

• computer scientist
• computer scientists
• computer virus
• computes
• computing
• computings
• computist
• computists
• compère
• compèred
• compères
• compèring
• Comr.
• comrade
• comrade-in-arms
• comradely
• comrades
• comradeship
• comradeships
• comrades-in-arms
• coms
• Comsat
• Comsomol
• comstocker
• comstockeries