• costor,
• coaster,
• costar,
• ckster,
• cpster,
• c0ster,
• c9ster,
• cozter,
• coxter,
• coeter,
• cosrer,
• cosfer,
• cos6er,
• cos5er,
• costwr,
• costsr,
• costdr,
• koster,
• Kostar,
• Kosater

• co-star,
• cistern,
• custer,
• caster,
• coastward,
• coaster.

The adjective form of the word "Coster" is "costermonger".

The plural of the "Coster" can be the "costers".

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