Opening is part of Surface. Pocket is a type of Opening. you are likely to find Key in/at/on Pocket. 
Longtime is the opposite of New. New is related to City. City is related to Noise. 
Surface <--PartOf-- Opening <--IsA-- Pocket <--AtLocation-- Key 
Longtime <--Antonym--> New <--RelatedTo--> City <--RelatedTo--> Noise 