Efficiency is a synonym of Effectiveness. Effectiveness is a type of Power. Power is related to Heat. Heat is related to Sorry. 
Eyebrow is part of Face. Face is related to Turn. Turn is related to Direction. Direction is a synonym of Commission. 
Efficiency <--Synonym--> Effectiveness --IsA--> Power <--RelatedTo--> Heat <--RelatedTo--> Sorry 
Eyebrow --PartOf--> Face <--RelatedTo--> Turn <--RelatedTo--> Direction <--Synonym--> Commission 