1. One who becomes security for another.

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

• cautionary,
• xautioner,
• vautioner,
• fautioner,
• dautioner,
• czutioner,
• csutioner,
• cwutioner,
• cqutioner,
• caytioner,
• cahtioner,
• cajtioner,
• cationer,
• cautoner,
• cautiner,
• Cauuioner,
• Coutioner,
• Cautiuner,
• Cationeer,
• Cautinera

• cautions,
• Cautioned,
• caution.

The plural of the "Cautioner" can be the "cautioners".

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