Expensive is a synonym of Dear. Dear is related to Introduction. Introduction is derived from Introduce. Debut is a type of Introduce. 
Concern is related to Crop. Crop is related to Field. you are likely to find Cemetery in/at/on Field. Cemetery is related to Grave. 
Expensive <--Synonym--> Dear <--RelatedTo--> Introduction --DerivedFrom--> Introduce <--IsA-- Debut 
Concern <--RelatedTo--> Crop <--RelatedTo--> Field <--AtLocation-- Cemetery <--RelatedTo--> Grave 