Treatment is a synonym of Intervention. Intervention is a type of Engagement. Engagement is related to Promise. Promise is a type of Be. 
Intimate is a type of Hint. Intimate is a synonym of Informal. 
Treatment <--Synonym--> Intervention --IsA--> Engagement <--RelatedTo--> Promise --IsA--> Be 
Hint <--IsA-- Intimate <--Synonym--> Informal 