A family of Microsoft word processing software products for creating web, email, and print documents.
If the PDF was originally created from a text document, and not from scanning a paper document without conversion to text (OCR), then do not "insert" the PDF into a Word document.
Instead, use the File > Open command to open the PDF file. Word will retrieve the text from the PDF and turn it into regular Word text. (Any pictures within the PDF will remain as pictures in the Word file.) You can then save and use that document as is, or copy/paste it into another Word document.