1. One of a military tribe, skilful as horsemen, inhabiting the south-eastern parts or steppes of Russia.

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

• cossal,
• colasack,
• coack,
• cossak,
• croswsjack,
• cossjack,
• crrossjack,
• hoppsack,
• votyack,
• kassack,
• ooppack,
• wolsack,
• cosack,
• cossac,
• kossack,
• Cossakk,
• corsakk,
• cossas,
• cossatu,
• cossah

• crack,
• cosec,
• sack,
• cocus,
• couscous,
• cock,
• cosmic,
• corsage,
• carsick,
• cocos.

The adjective form of the word "Cossack" is "Cossack". Both the noun and the adjective forms remain the same.

The plural of the "Cossack" can be the "Cossacks".

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