1. A buoy that makes a whistling noise
   - whistling buoy

Type of: acoustic buoy

• Rubiaceae
• rubiaceous plant
• Rubiales
• rubicelle
• Rubicon
• rubicund
• rubicundity
• rubidium
• rubidium-strontium dating
• rubify
• rubiginous
• Rubin test
• Rubinstein
• ruble
• rubor
• rubric
• rubrical
• rubricate
• Rubus
• Rubus australis
• Rubus caesius
• Rubus canadensis
• Rubus chamaemorus
• Rubus cissoides
• Rubus cuneifolius