English also has a marvelous and unique proclivity for making nouns into verbs, almost without limit. We can "Google" something or "railroad" someone. One of my favorite examples was in the film, "The King's Speech", when King Edward's brother asks him what he has been doing lately, he replies the he has been "kinging".
Making nouns into verbs:
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Entirely true. And your observation is a useful one.
But on the other hand, I doubt that we can find another modern language (except maybe Esperanto) where -- to one degree or another -- the situation is basically different.
That is, while spoken and written always are somehow related, they are never so closely related that a high degree of competency in reading automatically ensures competency in conversation.