Microsoft Word includes several default text highlight colors that you can use to highlight text in your documents. The default highlight colors in Microsoft Word are:

1. Yellow
2. Green
3. Cyan
4. Magenta
5. Red
6. Dark Blue
7. Teal
8. Pink
9. Blue
10. Light Blue

You can access these default highlight colors by selecting the text you want to highlight and then clicking on the "Text Highlight Color" button in the "Font" group on the "Home" tab. The default highlight colors will appear as a drop-down menu, and you can select the desired color from the list.

Keep in mind that you can also customize the highlight colors in Microsoft Word to include additional colors or to create your own custom colors. To do this, click on "More Colors" at the bottom of the drop-down menu and then select the "Custom" tab in the "Colors" dialog box. From there, you can create your own custom highlight color by adjusting the RGB or HSL values.

Microsoft Word includes several default text highlight colors, including dark yellow, black, and violet. However, there is no default highlight color that is orange.

That being said, you can customize the highlight colors in Microsoft Word to include a wider range of colors, including orange. Here's how:

1. Select the text you want to highlight.
2. Click on the "Text Highlight Color" button in the "Font" group on the "Home" tab.
3. Click on "More Colors" at the bottom of the drop-down menu.
4. In the "Colors" dialog box, select the "Custom" tab.
5. Use the color picker or enter the RGB or HSL values for the color you want to use.
6. Click "OK" to apply the new highlight color to the selected text.

So while there is no default highlight color in Microsoft Word that is orange, you can certainly create a custom highlight color in that hue if you wish.