What is one word you use often that spell check ALWAYS has to spell correctly for you?

Mine is the word: Definitely!

Millennium........I always forget the second "n".

I'm always second-guessing myself with "affect" and "effect". I have to check it every time.

Definitely. ..don't know why. It's a glitch for me. Just used the spell check for it just now.

I should write it 100 times one day to get over that hump...ha..definitely one day.