1. Definitely
    I unknowingly spelled this word wrong for years.
  2. Prominent and dominant
    I write these words a lot for my job and always forget if they end in -ant or -ent. It doesn't help that they're both different.
  3. Silhouette
    Go figure that when I typed the word here just now I spelled it right the first time for what might be the first time ever.
  4. Philadelphia
    I don't know why this is so hard for me to spell.
  5. Exhibit
    I forget that damn silent H.
  6. Extinguish
    I always want to type exstinguish
  7. Calendar
    Calander? Calender? I have such a hard time getting it right, though it's gotten better.
  8. Maintenance
    It's not maintainance. I know this, yet I always spell it like this.
  9. Character
    Not charactar or charecter
  10. Hypocrite
    I forget the e at the end.
  11. Resurgence
    I didn't realize I had trouble spelling this word until Independence Day: Resurgence became a thing.
  12. Leapt
    I always want to write lept, I don't know why.
  13. Coincidence
    Thx auto-correct! 😎👍
    Suggested by @lesleyann
  14. Necessary
    Auto correct is a godsend
    Suggested by @marcintosh