This I just found and it might be useful in two or three applications: You can shut off the spell checker in Google Docs. Most people are smarter than I am, and so probably already knew that. Here's the quote from the help page:
Spelling suggestions as you typeAs you type, Docs automatically underlines in misspelled words in red. Right-click an underlined word to see the suggested correction and replace the misspelled word.You can turn off the spell-checker by unchecking from the drop-down menuClick here for the full page.
There are two times I can use this:
1) During an everyday type activity when I want students to focus on composing volumes rather than editing and fretting over perfection.
2) During California Exit Exam proctoring when a very few number of my students have "use of a word processor with the spell checker turned off" written in as an accommodation during the testing. Then I can have them sign in to a convenient Chromebook without disrupting the other testers or having to arrange a second adult proctor to escort them to a separate place with a clunky desktop that may or may not work, or possibly has an older version of Word etc. etc.
I hope this is useful for others too.