As far as I know, Preview can’t convert PDF to Word. You can open a PDF in Preview, copy the text content and images and then paste them in a Word document. To convert a PDF to a Word and keep the formatting, you need to use a PDF to Word converter.
What is the difference the “Convert PDF to Word” feature and Preview “Converter”? For converting a PDF to a Word, the software does not contain the magic wand, it just takes the images and text content and converts them. This is what the software does. Preview has been designed to do it more intuitively, however you can convert your PDF without being able to do it with Preview because it is designed to support PDF to Word conversion. What software are you using if I want to convert to/from PDF to Word? Many applications let you convert PDF to/from Word.