Hard is related to Rock. Rock is a synonym of Protection. Protection is a type of Activity. Service is a type of Activity. 
Suicide can be Tragic. Tragic is derived from Tragedy. Tragedy is the opposite of Comedy. 
Hard <--RelatedTo--> Rock <--Synonym--> Protection --IsA--> Activity <--IsA-- Service 
Suicide --HasProperty--> Tragic --DerivedFrom--> Tragedy <--Antonym--> Comedy 