Exciting is related to Interesting. Stuff can be Interesting. Stuff is related to Sugar. Sugar is the opposite of Pepper. 
Expensive is related to Gas. Gas is related to Fire. Fire is related to Sun. Sun is related to Outer. 
Exciting <--RelatedTo--> Interesting <--ReceivesAction-- Stuff <--RelatedTo--> Sugar <--Antonym--> Pepper 
Expensive <--RelatedTo--> Gas <--RelatedTo--> Fire <--RelatedTo--> Sun <--RelatedTo--> Outer 