different between speller vs sheller

English

spell +? -er

speller (plural spellers)

A person who spells.
I'm a slow reader but a good speller.
- 2005, Michael W. Riley, Plato's Cratylus: Argument, Form, and Structure (page 124)
  Without insisting on a difference between the inventors and the spellers of words, Socrates makes short work of this case.
A participant in a spelling bee.
(US) A book used to learn how to spell properly.
(computing) A spell checker.
- 1987, PC Mag (volume 6, number 17, page 358)
  But Word's spelling program still isn't fully integrated into the word processor. For one thing, any changes and corrections you make from the speller's menus don't appear on-screen until you get back to your original file.

shell +? -er

sheller (plural shellers)

One who, or that which, shells.
a corn sheller
an oyster sheller
a sunflower seed sheller

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