Safe is related to Small. Small is related to Box. Box is related to Top. Top is a synonym of Kill. 
Devil is a synonym of Bother. Bother is related to Being. 
Safe <--RelatedTo--> Small <--RelatedTo--> Box <--RelatedTo--> Top <--Synonym--> Kill 
Devil <--Synonym--> Bother <--RelatedTo--> Being 