The correct and universally accepted standard English spelling is guard (with the 'u' preceding the 'a'). The spelling "gaurd" is a very common typographical error and incorrect misspelling. A helpful memory mnemonic to remember the correct spelling is that the letters u and a appear in alphabetical order within the word's middle sequence, or keeping in mind that the protective letter 'u' stands right beside 'g' before the vowel 'a' takes its standard phonetic placement.
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