Lost is a form of Lose. Lose is related to Leave. Leave is the opposite of Wash. Wash is a type of Separate. 
Big is related to Battle. Battle is related to Attack. Attack is related to Physical. Physical is related to Fight. 
Lost --FormOf--> Lose <--RelatedTo--> Leave <--Antonym--> Wash --IsA--> Separate 
Big <--RelatedTo--> Battle <--RelatedTo--> Attack <--RelatedTo--> Physical <--RelatedTo--> Fight 