It's easy to convert a Word document to a PDF, either in Word or in Adobe Acrobat Pro. Once converted, you can automatically create a writable form with the Form features in Acrobat and then modify the form as necessary.
After you launch Word, select Open, navigate to the location where your Word document is stored, select the file and choose Open.
When the document opens, select File and then choose Export. Select Create Adobe PDF from the menu, choose the Create Adobe PDF button, type a file name for the converted file and choose Save.
Launch Adobe Acrobat Pro to open the PDF document and create a form from it. Choose File. Select Create and then Create Form.
Choose Select a file, navigate to the location where you stored the converted Word document, select the file and choose Open. Leave the form field auto detection set to On and choose Start to create the form from your converted Word document.
Review the form that Acrobat Pro automatically created and modify it as necessary. Use the editing icons next to Prepare Form to add new writable fields to the document, use the formatting buttons at the top of the right column to align your labels and data fields; you can also modify the names of the data fields assigned to the writable values if you want them to be different. Choose the blue Preview button on the Prepare Form line to preview a copy of the form.
For example, to add a field that wasn't converted from Word, such as the Comments field, choose the button to add a new text field, position the field on your form, use the handles on the bounding box to size the field and type a name for the new field.
Click the Save button at the top of the screen to save your changes.