Belly is a type of Album. Belly is a type of Swell. 
Envelope is a type of Bag. you are likely to find Letter in/at/on Envelope. Letter is a type of Award. Award is a synonym of Prize. 
Album <--IsA-- Belly --IsA--> Swell 
Bag <--IsA-- Envelope <--AtLocation-- Letter --IsA--> Award <--Synonym--> Prize 