Related Clues:

• Ark or bark, e.g.
• Sea vessel
• Liner, for one
• Combat vessel
• Fleet component
• Mayflower, for one
• Bark or junk
• Mail in a box
• It may go in a lock
• Ocean liner, for one
• Mail out
• Monitor or Merrimack
• Send in a crate
• Mail away
• Scow or skiff