whippersnapper /(h)wipˈər-snap-ər/ (old informal)

1. A cheeky young lad
2. Any lowly person who behaves impudently

• opinion polls
• opinions
• opioid
• opioids
• opisometer
• opisometers
• opisth-
• opistho-
• opisthobranch
• Opisthobranchia
• opisthobranchs
• opisthocoelian
• opisthocoelous
• opisthodomoi
• opisthodomos
• opisthoglossal
• opisthognathous
• opisthograph
• opisthographic
• opisthographies
• opisthographs
• rattlebrain
• rattle-brained
• rattlebrains
• rattled