Treatment is a synonym of Intervention. Intervention is a type of Engagement. Engagement is a synonym of Involvement. 
Tool is related to Rope. Rope is related to Climb. Climb is the opposite of Hang. Hang is related to Die. 
Treatment <--Synonym--> Intervention --IsA--> Engagement <--Synonym--> Involvement 
Tool <--RelatedTo--> Rope <--RelatedTo--> Climb <--Antonym--> Hang <--RelatedTo--> Die 