coistrel or coistril /koisˈtril/

1. A groom (obsolete)
2. A knave (Shakespeare)

• rataplans
• rat-arsed
• ratas
• rat-a-tat
• ratatouille
• ratatouilles
• ratbag
• ratbags
• ratbite fever
• ratbite fevers
• rat-catcher
• rat-catchers
• rat-catching
• ratch
• pitifully
• pitifulness
• pitifulnesses
• pitiless
• pitilessly
• pitilessness
• pitilessnesses
• pitman
• pitmen
• pit-mirk
• piton