Bullet is related to Nut. Nut is a synonym of Head. Chef is etymologically related to Head. 
Guard is related to Building. you are likely to find Electricity in/at/on Building. 
Bullet <--RelatedTo--> Nut <--Synonym--> Head <--EtymologicallyRelatedTo-- Chef 
Guard <--RelatedTo--> Building <--AtLocation-- Electricity 