-n't shortened (enclitic) form of not¹

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)

• buckayros
• buck-basket
• buck-baskets
• buckbean
• buckbeans
• buckboard
• buckboards
• bucked
• buckeen
• buckeens
• bucker
• buckeroo
• buckeroos
• buckers
• bucket
• bucket and spade
• bucketed
• bucketful
• bureaucratically
• bureaucratisation
• bureaucratise
• bureaucratised
• bureaucratises
• bureaucratising
• bureaucratist