Competitor is a synonym of Opponent. Opponent is related to Team. Section is a type of Team. Book is a type of Section. 
Water is a type of Nutrient. you are likely to find Water in/at/on Theater. Theater is related to Debut. 
Competitor <--Synonym--> Opponent <--RelatedTo--> Team <--IsA-- Section <--IsA-- Book 
Nutrient <--IsA-- Water --AtLocation--> Theater <--RelatedTo--> Debut 