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

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

• lettered
• letterer
• letterers
• letter-founder
• letter-founders
• letter-gae
• letterhead
• letter-heading
• letterheads
• lettering
• letterings
• letterless
• letter missive
• lettern
• letter of attorney
• letter of comfort
• letter of credit
• letter of indication
• letter-of-marque
• letter of peace
• letter-perfect
• letterpress
• letterpresses
• letter quality
• letter-quality