I always felt the vocabulary choices reflected that the story is told in the first person by a young farm child that is surrounded by other farm familys. Not that I mean of course, that many young children, not to mention farm children, don't at least know some challenging and not frequently used vocabulary words. I did as a child (but I couldn't always spell them or pernounce them correctly.) and I have known many young children that know some. But unlike today when many children can hear knew words from the raido, television, internet, etc., not to mention the more wider variety of books available to most people that aren't upperclass, most children's access to broader vocabulary was through the people around them, school books (if you went to school or were homeschooled), and, if it applied to your family, preacher/Sunday school teacher/Bible etc.
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