1. One who grumbles.

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

• grummble,
• grubble,
• grummbles,
• grumbeled,
• grummbled,
• crumbley,
• grumbbles,
• crumbler,
• vrumbler,
• brumbler,
• hrumbler,
• yrumbler,
• trumbler,
• grumblez,
• grumblly,
• trumblel,
• grumblierr,
• grumbliere,
• grumblyer,
• Grumley

• gambler,
• grumbles,
• rumble,
• crumble,
• grumble,
• grumbled,
• grenoble,
• grumbling.

The adjective form of the word "grumbler" is "grumbling".

The plural of the "grumbler" can be the "grumblers".

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