you are likely to find Math in/at/on Class. Agriculture is a type of Class. Agriculture is related to Corn. Corn is the opposite of Agricultural. 
Big is the opposite of Little. Little is related to Child. Peanut is a type of Child. Peanut is a type of Nut. 
Math --AtLocation--> Class <--IsA-- Agriculture <--RelatedTo--> Corn <--Antonym--> Agricultural 
Big <--Antonym--> Little <--RelatedTo--> Child <--IsA-- Peanut --IsA--> Nut 