How to spell DIARHEOA correctly?

The correct spelling for "diarheoa" is actually "diarrhea". Common misspellings like this can be corrected by employing mnemonic tricks, like the phrase "runny gut" or remembering it is spelled with a double "r" and "r" sits right beside "e" on the keyboard. Proofreading and relying on spell-check tools can also help eliminate such errors.