There are 11 words that start with 'columb'.
| columbic | columbary | columbine |
| columbite | columbium | columbaria |
| columbines | columbites | columbiums |
| columbaries | columbarium | |
Note: These 11 words that start with 'columb' are found from the USA & Canada version of the tournament Scrabble word list.