Spell Checker checks the spelling in the description, memo, notes, and message fields on a variety of forms. As a rule, whenever you see the Spelling button in a form or window, you can spell check most of the fields where you enter text.
You can run Spell Checker automatically by turning it on in Preferences.
From the QuickBooks Edit menu, select Preferences.
In the Preferences window, select Spelling.
Check the Always check spelling before printing, saving, or sending supported forms box.
You can identify words to ignore as well as add custom spelling words on the same preference page.
If you've turned off the Spell Checker preference, you can still check the spelling on purchase orders and sales forms by selecting the Formatting tab at the top, then selecting Spelling.