You can use Term Conversion on a work's page.
Tap the "Convert terms" button under the cover image to open the Term Conversion settings.
Enter the words you'd like the terms to be  changed to, and then tap "Apply and start reading". (If you leave a term blank, it won't be converted)

* If you'd like to enable Term Conversion for your own work, you'll need to set it on the mobile or desktop versions of pixiv.

* If the person who posted the work doesn't have Term Conversion enabled, this feature cannot be used.