coistrel or coistril /koisˈtril/

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

• half-a-crown
• half-adder
• half-adders
• half-a-dozen
• half-and-half
• half-ape
• half-apes
• half-arsed
• halfas
• half-a-sovereign
• half-assed
• halfback
• halfbacks
• half-baked
• half-ball
• half-balls
• half-baptise
• half-baptize
• half-baptized
• half-baptizes
• half-baptizing
• halfbeak
• halfbeaks
• half-binding
• half-blood