1. A performer; one who performs what is required.

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

• diser,
• dorr,
• donr,
• boder,
• edoor,
• diery,
• doyu,
• voir,
• doea,
• deeer,
• boerd,
• doller,
• dore,
• droor,
• doard,
• dooers,
• donei,
• doree,
• deaer,
• dener

• Dora,
• doorway,
• doura,
• dower,
• doe,
• dowry,
• Dorr,
• Dorey,
• doerr,
• dourah,
• dowery,
• Dori,
• Dore,
• dozer,
• dory,
• door,
• Dorie,
• dour,
• Does,
• hoer,
• Doria,
• deer.

The adjective form of the word "doer" is "doerly". However, "doerly" is not a commonly used adjective, and it may be more appropriate to use phrases like "active" or "productive" to describe someone who is a doer.

The plural of the "doer" can be the "doers".

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