Govern is a type of Control. Control is related to Charge. Charge is related to Electrical. Electrical is derived from Electric. 
Focus is related to Lens. Lens is related to Device. 
Govern --IsA--> Control <--RelatedTo--> Charge <--RelatedTo--> Electrical --DerivedFrom--> Electric 
Focus <--RelatedTo--> Lens <--RelatedTo--> Device 