Pitch is related to Night. Night is a type of Book. Book is related to Social. Social is related to Fashion. 
Pool is a type of Organization. Organization is related to Nonprofit. Nonprofit is the opposite of Business. Airline is a type of Business. 
Pitch <--RelatedTo--> Night --IsA--> Book <--RelatedTo--> Social <--RelatedTo--> Fashion 
Pool --IsA--> Organization <--RelatedTo--> Nonprofit <--Antonym--> Business <--IsA-- Airline 