Burden is related to Weight. Weight is related to Big. Big is related to School. you are likely to find Homework in/at/on School. 
Double is the opposite of Half. Half is related to Percentage. Percentage is a synonym of Share. 
Burden <--RelatedTo--> Weight <--RelatedTo--> Big <--RelatedTo--> School <--AtLocation-- Homework 
Double <--Antonym--> Half <--RelatedTo--> Percentage <--Synonym--> Share 