A person who works with crayons, especially an artist who specializes in crayon art; someone who draws with crayons.
From 'crayon' with the agent noun suffix '-ist,' which creates words for people who do or practice something.
The '-ist' suffix is incredibly productive in English—we use it to turn almost any noun into a profession ('pianist,' 'violinist,' 'crayonist'), showing how flexible English word-building is.
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