Lane is a synonym of Alley. Alley is the opposite of Street. Street is related to Small. 
Heavy is related to Elephant. Elephant is related to War. War is related to Union. Union is a synonym of Sum. 
Lane <--Synonym--> Alley <--Antonym--> Street <--RelatedTo--> Small 
Heavy <--RelatedTo--> Elephant <--RelatedTo--> War <--RelatedTo--> Union <--Synonym--> Sum 