RDF

1. Radio direction-finding (or -finder)
2. Refuse-derived fuel

• rifest
• riff
• riffage
• riffed
• riffing
• riffle
• riffled
• riffler
• rifflers
• riffles
• riffling
• riff-raff
• riffs
• rifle
• rifle bird
• rifle birds
• rifle corps
• rifled
• rifle green
• rifle grenade
• rifle grenades
• rifleman
• rifleman bird
• rifleman birds
• riflemen