Flat is related to Plane. you are likely to find Pillow in/at/on Plane. Pillow is related to Cotton. Cotton is related to Candy. 
Compound is a type of Chemical. Base is a type of Chemical. Base is a synonym of Infrastructure. 
Flat <--RelatedTo--> Plane <--AtLocation-- Pillow <--RelatedTo--> Cotton <--RelatedTo--> Candy 
Compound --IsA--> Chemical <--IsA-- Base <--Synonym--> Infrastructure 