It also works the other way around. People who get the highest paying jobs begin developing a different vocabulary.
Your post remind me of a Zen story. A professor finally had a chance to talk with a Zen monk he admired for being so peaceful and in control of his life. As a professor he studied the subject at length.
So when he gets a chance to have tea with this Zen monk. He starts telling the monk everything he learned. Talking non stop telling what he learned in answer to his own questions. Meanwhile the Monk is serving the tea and he pours tea into the professors cup while he's talking. Soon the cup is overflowing and the Monk keeps pouring as the professor keeps talking. Finally as tea starts spilling onto his shoes the professor stops talking and reacts, telling the monk with a start that the cup is too full.
Yes, the Monk replied. No more will go into the cup. One must empty it a bit first before you can put more in. You are full like the cup no more will go in. You need to go and use what you already learned to empty your cup. Then you will be ready to learn what I can teach you.
One thing I don't understand, Why is it so important to know all the words in the dictionary. Do you realise if you learned 5 words a day you'd know the dictionary in 10 years. I don't get what the point is.
I remember when I played with learning more words from the dictionary. I had no one to have a conversation with, they told me to speak English for goodness sake.
Alex