There are words you understand when you hear them and there are words that you understand when you read them; there are words you use correctly that you know how to say and there are words you use correctly that you know how to write.The other disadvantage of having a really good vocabulary that you have acquired from reading is that you know a lot of words, but ... you haven't heard them spoken.
Which means that you will whip out your 25-cent words, and then find out that no, you don't know how to say them.
Did this happen to me with aficionado when I was very young? No, and only a bard would repeat that damnable lie.