Diminish is a synonym of Contract. Contract is a synonym of Reduce. Spill is a type of Reduce. 
Hard is related to Door. you are likely to find Door in/at/on Theater. Theater is related to Debut. 
Diminish <--Synonym--> Contract <--Synonym--> Reduce <--IsA-- Spill 
Hard <--RelatedTo--> Door --AtLocation--> Theater <--RelatedTo--> Debut 