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

Type of: mail

• endeavour
• Endecott
• ended
• endemic
• endemic disease
• endemic typhus
• endemical
• slimeball
• slimed
• slimily
• sliminess
• slimline
• slimly
• slimness
• slimsy
• slimy
• sling
• slingback
• slinger
• slinger ring
• slinging
• slingshot
• slink
• slinky
• slip