A family of Microsoft word processing software products for creating web, email, and print documents.
I found this guide on reddit that solved the problem for me - https://www.reddit.com/r/Office365/comments/6yvvp3/ms_word_document_bouncingshaking_when_typing_or/
For the lazy:
Control panel > System and security > System > Advanced system settings (in upper-left side) > Advanced tab > Settings in Performance box > Visual effects: Here disable Animate controls and elements inside windows (I disabled all three check boxes with the word Animate).