Elite is the opposite of Common. Common is related to Regular. Regular is the opposite of Strong. Strong is related to Sentiment. 
Headache is derived from Head. Head is related to Round. 
Elite <--Antonym--> Common <--RelatedTo--> Regular <--Antonym--> Strong <--RelatedTo--> Sentiment 
Headache --DerivedFrom--> Head <--RelatedTo--> Round 