Spellchecko
Noun. A spellchecko is similar to a typo, it is a real-but-incorrect word helpfully inserted by spellcheck software. It may happen when a spellchecker guesses the wrong word to fix a typo, or when it does not recognize a correct name or correct word and mistakenly "fixes" it into some wrong real word.
If you type "Mrs. Breats gave me two nicples for a dime" your computer may make a spellchecko on the proper name "Breats", and additional spellchecko while fixing the nickle typo:
"Mrs. breasts gave me two nipples for a dime."
"Mrs. breasts gave me two nipples for a dime."