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There is no problem in using new (or even non-existent) words in your story. However... Writers do this all the time. It is part of the experience to develop a larger vocabulary. But when we learn...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/38017 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There is no problem in using new (or even non-existent) words in your story. However... Writers do this all the time. It is part of the experience to develop a larger vocabulary. But when we learn a new word that we want to use, it is our task to try not to disturb the reader too much by making him interrupt the story and look for the word in a dictionary. The main part of using these new words is check how they sound and how you would use it in a sentence. Write these sentences down and see if they make sense. Try to figure out in which context it works best and how to describe this to someone who has never heard about this word before. If the meaning is understood immediately, you are ready to use this in your story. (A useful resource: [University of Toronto - Writing Advice: Dealing with New Words](http://advice.writing.utoronto.ca/researching/new-words/))