Tennis is a type of Exercise. Tennis is related to Double. Double is the opposite of Single. Single is related to Bell. 
Help is related to Trouble. Trouble is a different concept from Assure. Assure is a synonym of Convince. Convinced is a form of Convince. 
Exercise <--IsA-- Tennis <--RelatedTo--> Double <--Antonym--> Single <--RelatedTo--> Bell 
Help <--RelatedTo--> Trouble <--DistinctFrom--> Assure <--Synonym--> Convince <--FormOf-- Convinced 