I’ve noticed so many spelling errors in documents I read that I have concluded many people pay no attention to their spellcheckers.
Here are some words that all end with the same sound, “seed,” but can be separated into three categories:
SEDE—Only one English word ends with this: supersede.
CEED—Only three English words end with this: succeed, proceed and exceed.
CEDE—All other English words ending with the “seed” sound use this: intercede, precede, accede, etc.
I still encourage you to pay attention to the markings your spelling and grammar check programs make on your documents.