Rally is a synonym of Exchange. Exchange is related to Return. Return is a type of Arrival. Arrival is the opposite of Depart. 
Burden is related to Carry. Carry is related to Port. 
Rally <--Synonym--> Exchange <--RelatedTo--> Return --IsA--> Arrival <--Antonym--> Depart 
Burden <--RelatedTo--> Carry <--RelatedTo--> Port 