500 000 is the amount of words in the English language.
5000 is the amount of words used by an average native speaker (my vocabulary is about a half of that at best :-) ).
24000 words are in Shakespeare's vocabulary.
There are words that lost their meanings from being overused, like "love" in "love you". These words are bright and shiny, like the bronze door knob in an Irish pub.
On other hand, there are some words that people hate, and that what happens to the "must", which no one likes to use.
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