Bulb is related to Seed. Nut is a type of Seed. 
Tennis is a type of Exercise. Tennis is related to Net. Net is related to Wide. Wide is related to Web. 
Bulb <--RelatedTo--> Seed <--IsA-- Nut 
Exercise <--IsA-- Tennis <--RelatedTo--> Net <--RelatedTo--> Wide <--RelatedTo--> Web 