Originally Boulevard were built around or in place of rampart of medieval cities. Boulevard comes from dutch word “bolwerk” that means rampart (I think, I had to use translation tool for this, I don’t speak dutch)
Avenue is a straight line, surrounded by trees. The name comes from “avenir” which in old french means “coming to”, usually avenu went straight to a monument or the town center.
Than the words evolved in every country to mean whatever they mean now lol.
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