1. Four years of age

See also: immature, young

• drugs bust
• drugstore
• Druid
• druidism
• drum
• drum brake
• drum machine
• drum major
• drum majorette
• drum out
• drum printer
• drum roll
• drum sander
• drum up
• drum-like
• drum-shaped
• drumbeat
• drumbeater
• drumfire
• drumfish
• drumhead
• drumhead court-martial
• drumlin
• drummer
• drumming