- Misspell is the correct spelling.
- Mispell is a common error.
- The past tense of misspell is misspelled in American English. However, in other varieties of English, misspelt is also acceptable.
One way of improving the accuracy of your writing is to spell things right. In fact, the word that means to spell things wrong is an important word to spell correctly. Which is correct—misspell or mispell?
Misspell vs. Mispell: Which Spelling Is Right?
Mis- is a prefix that means “wrong” or “mistaken.” When you add it to the verb spell, it means to spell incorrectly. The correct spelling is misspell. Be careful not to omit the second S in derivative forms, such as misspelling and misspells.
Misspelled or Misspelt?
If you live in the United States, the past tense form of spell is spelled. Elsewhere, you might see a variant past form—spelt. The distinction also applies to misspell. You might see misspelled or misspelt depending on the author or intended audience.
Misspell is the correct spelling. However, there are two ways to make the past form of misspell—misspelled or misspelt. If you want to continue to improve your accuracy, make sure you know whether the correct spelling is occured, ocurred, or occurred.
from Grammarly Blog https://www.grammarly.com/blog/misspell-mispell/