Western is related to Rifle. Rifle can be used for Killing. Sword can be used for Killing. Sword is similar to Knife. 
Enter is a different concept from Exit. Exit is a synonym of Outlet. 
Western <--RelatedTo--> Rifle --UsedFor--> Killing <--UsedFor-- Sword <--SimilarTo--> Knife 
Enter <--DistinctFrom--> Exit <--Synonym--> Outlet 