knapskull, knapscull or knapscal /napˈskəl/ (obs Scot)

A kind of helmet

• under sealed orders
• undersealing
• undersealings
• underseals
• under-secretaries
• under-secretary
• under-secretaryship
• under-secretaryships
• underself
• undersell
• underseller
• undersellers
• underselling
• undersells
• underselves
• undersense
• undersenses
• under separate cover
• underserved
• underset
• undersets
• undersetting
• undersexed
• undershapen
• under-shepherd