The word is with w-it-h\
Other 4 letter words with it in the middle:
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Four letter words with o e in the middle are: coeddoerdoesfoesgoergoeshoedhoerhoesJoeljoesjoeykoelnoelnoespoempoetroestoeatoedtoesvoeswoeszoea
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the answer is puts
There is a huge number of 4 letter words that have ea in the middle. bead beak beam bean bear beat and so on
Some 4 letter words with 'au' in the middle:FauxHaulMaulTautSee the related link for a full list.