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One way to accomplish this is by using the same word roots and structure of swear words but modifying them in a way that is not immediately obvious. For example, think of the ominous land of "Mordo...
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One way to accomplish this is by using the same word roots and structure of swear words but modifying them in a way that is not immediately obvious. For example, think of the ominous land of [" **Mordor**" in Lord of the Rings](http://lotr.wikia.com/wiki/Mordor), which uses the same root as "Murder", a very negative thing. J.K. Rowling employed this tactic as well when naming places, things and characters. For example, the hostile and dark Professor **Severus Snape**'s name is based on the roots and phonemes of "severe", and "snake" - words with negative connotations. With swear words you can do the same. You can use sounds from existing swear words and build new components around them. Another way to go about it could be to combine two or more existing swear words in such a way that the connotation is obvious but the source is not, for example with the word **"shmilfke"**.