Safe is a type of Hardware. Safe is a different concept from Drop. Drop is related to Use. Use is related to Blow. 
Compliance is the opposite of Violation. Violation is a type of Situation. Situation is related to Deal. Deal is related to Buy. 
Hardware <--IsA-- Safe <--DistinctFrom--> Drop <--RelatedTo--> Use <--RelatedTo--> Blow 
Compliance <--Antonym--> Violation --IsA--> Situation <--RelatedTo--> Deal <--RelatedTo--> Buy 