Related Clues:

• Sea 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
• Send in a crate
• Mail away
• Scow or skiff
• Salt container?
• Citizen or scholar closer
• Ocean traveler
• One of the S's in U.S.S.