Door is related to Common. Common is a different concept from Rare. Rare is the opposite of Frequent. Frequent is the opposite of Secular. 
Infrastructure is related to Bridge. Bridge is related to Connection. 
Door <--RelatedTo--> Common <--DistinctFrom--> Rare <--Antonym--> Frequent <--Antonym--> Secular 
Infrastructure <--RelatedTo--> Bridge <--RelatedTo--> Connection 