Tragedy is a type of Drama. Drama is related to Stage. Stage is related to People. People is a type of Fill. 
Battery is a type of Team. Team is a type of Group. Group is a synonym of Crew. 
Tragedy --IsA--> Drama <--RelatedTo--> Stage <--RelatedTo--> People --IsA--> Fill 
Battery --IsA--> Team --IsA--> Group <--Synonym--> Crew 