Specialize is derived from Special. Special is a synonym of Limited. 
Fee is related to Price. Price is related to Admission. Admission is related to Hospital. Hospital is related to Operation. 
Specialize --DerivedFrom--> Special <--Synonym--> Limited 
Fee <--RelatedTo--> Price <--RelatedTo--> Admission <--RelatedTo--> Hospital <--RelatedTo--> Operation 