Arena is a type of Weapon. Weapon can be used for Hurt. Hurt is a synonym of Injury. 
Edit is derived from Editor. Edit is related to Crop. Cotton is a type of Crop. 
Arena --IsA--> Weapon --UsedFor--> Hurt <--Synonym--> Injury 
Editor <--DerivedFrom-- Edit <--RelatedTo--> Crop <--IsA-- Cotton 