1. Mail that includes letters and postcards and packages sealed against inspection
   - first class, 1st class, first-class mail

Type of: mail

• dude ranch
• dudeen
• dudette
• dudgeon
• Dudley Moore
• Dudley Stuart John Moore
• duds
• due
• due care
• due date
• due diligence
• due east
• due north
• due process
• due process of law
• due south
• due west
• duel
• dueler
• duelist
• dueller
• duellist
• duenna
• duet
• duette