Body is related to Waste. Waste is related to Nuclear. 
Pain is the opposite of Good. Good is related to Permanent. Permanent is related to Power. Battery can be used for Power. 
Body <--RelatedTo--> Waste <--RelatedTo--> Nuclear 
Pain <--Antonym--> Good <--RelatedTo--> Permanent <--RelatedTo--> Power <--UsedFor-- Battery 