Convert it to EPUB using Calibre, then edit the EPUB using Sigil.
Just hope that the EPUB will be understandable with regard to editing; it's impossible to say what Calibre will do while converting. It depends on the Word document.
In this post I blatantly assume that Calibre can convert Word files. If it can't, then first save the Word document as a PDF (using a PDF printer for example), and then convert the PDF to EPUB.
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