Opposite is a synonym of Opposition. Opposition is the opposite of Ally. Ally is related to Diplomatic. 
you are likely to find Human in/at/on Airport. you are likely to find Nerve in/at/on Human. 
Opposite <--Synonym--> Opposition <--Antonym--> Ally <--RelatedTo--> Diplomatic 
Airport <--AtLocation-- Human <--AtLocation-- Nerve 