Village is a type of Mayor. Mayor is a type of Executive. Executive is related to Leader. Leader is a synonym of Boss. 
Pool is a type of Organization. Host is a type of Organization. Host is a type of Book. Night is a type of Book. 
Village --IsA--> Mayor --IsA--> Executive <--RelatedTo--> Leader <--Synonym--> Boss 
Pool --IsA--> Organization <--IsA-- Host --IsA--> Book <--IsA-- Night 