• ghust,
• ghostes,
• hostos,
• goasts,
• goost,
• ghoses,
• ghords,
• geists,
• geusts,
• gousts,
• kosts,
• gists,
• geasts,
• guists,
• gosts,
• ghoast,
• ghoust,
• goste,
• ghots,
• ghoasts

• casts,
• coasts,
• ghost gum,
• costs,
• ghostly,
• ghost,
• jests,
• posts,
• hoists,
• jousts,
• hosts.

The adjective form of the word "ghosts" is "ghostly".