Net can be used for Tennis. Net is related to Fish. Fish is related to Wet. 
Elephant is related to Big. Big is related to Range. Range is related to Limit. Limit is a synonym of End. 
Tennis <--UsedFor-- Net <--RelatedTo--> Fish <--RelatedTo--> Wet 
Elephant <--RelatedTo--> Big <--RelatedTo--> Range <--RelatedTo--> Limit <--Synonym--> End 