1. A small vessel employed in trading from port to port in the same country.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• coustmer,
• couster,
• coustem,
• coasre,
• costmer,
• cousters,
• castel,
• cester,
• coster,
• cousler,
• castr,
• coastel,
• coumter,
• costr,
• coasue,
• casier,
• coastr,
• saster,
• coatser,
• coastly

• caster,
• aster,
• Coasted,
• Coster,
• cost,
• coast,
• cloister,
• cast,
• Casterline,
• coasts,
• co-star,
• cater,
• Cosier,
• coastward,
• toaster.

The adjective form of the word "coaster" is "coastal".

The plural of the "coaster" can be the "coasters".

The singular of the "coaster" can be the "coaster".