Surgeon is derived from Surgery. Surgery is a type of Room. Room is related to Sky. Sky is related to Clear. 
Tackle is a different concept from Guard. Guard is related to Defensive. Defensive is the opposite of Offensive. 
Surgeon --DerivedFrom--> Surgery --IsA--> Room <--RelatedTo--> Sky <--RelatedTo--> Clear 
Tackle <--DistinctFrom--> Guard <--RelatedTo--> Defensive <--Antonym--> Offensive 