Empusa /em-pūˈzə/

1. A goblin or spectre sent by Hecate (Gr myth; also without cap; also empuseˈ)
2. A genus of fungi parasitic upon houseflies and other insects

• stiff-arm
• stiff-armed
• stiff-arming
• stiff-arms
• stiff bit
• stiff bits
• stiffed
• stiffen
• stiffened
• stiffener
• stiffeners
• stiffening
• stiffenings
• stiffens
• stiffer
• stiffest
• stiff-hearted
• stiffie
• stiffies
• stiffing
• stiffish
• stiffly
• stiff neck
• stiff-necked
• stiff-neckedness