Reading a lot means encountering a lot of words, some of them uncommon or otherwise interesting. I called this tag "word of the day" because I thought I might try making a note of an interesting word each day, like a self-made vocabulary builder calendar. I haven't done that, so far, but there's always tomorrow...
As a little comparison, some stats on word frequencies (from COCA, via wordfrequency.info):
|rank||word||words per occurrence|
What does this mean in real terms? A novel is on the order of 90k words on average, so you'd expect to read about three novels to encounter a particular word as rare as police at rank 10,015, and you'd expect to read about 275 novels to encounter a given word as rare as cavil at rank 61945.
Put another way, in each novel, you expect to see approximately:
Besides these, you'd see a variety of proper nouns, nonce words, and others not included in the frequency list.