1. American.

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

• coloumbia,
• colmbian,
• colombin,
• colombian,
• colubrian,
• columbiaa,
• xolumbian,
• volumbian,
• coloumbian,
• columban,
• cloumbian,
• coulmbian,
• columbien,
• columbiae,
• columbiade,
• columbine,
• colubium,
• columbimu,
• caluimbin,
• columbray

• colombian,
• collembola,
• columbite,
• columniform,
• colombo,
• columbia,
• colomb,
• columba,
• columbus,
• columbary,
• columbium,
• colombia,
• columbine,
• collembolan,
• coulomb,
• columbo,
• columbidae,
• columbarium.

The plural of the "columbian" can be the "Columbians".

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