In ​your site's text editor, the standard "Paste" button contains the same functionality as the Paste From Word button, and Word content will automatically be detected and cleaned.

The "​Paste​" button appears in the text editor window, as below.  To copy from a word document, select and copy ("Command+C") the text you'd like to paste rom your Word document, and then click the "paste" button in the website's text editor.  A pop-up box will appear where you'll insert the text from your Word document with "Command+V".  This will clean the special formatting from the word document.  A "Paste as Plain Text" button is also available, which will remove all formatting, and allows you to paste from other text editors, websites, and non-standard formats.