1. A large stone worn roundish by water; a mass of more or less rounded rock that has been transported to a distance from its native bed.

2. A large rounded stone.

3. Containing boulders.

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

• boder,
• boerder,
• choulder,
• bourder,
• boluder,
• boulverd,
• ballder,
• boilder,
• boundier,
• buider,
• biulders,
• bulde,
• bolier,
• soulder,
• boilier,
• brouder,
• oilder,
• boilded,
• shulder,
• bulder

• Bolter,
• bouldered,
• bouldery,
• bowlder,
• boelter,
• bolder,
• Boulter,
• builder.

The adjective form of the word "boulder" is "bouldered".

The plural of the "boulder" can be the "boulders".

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