One spelling is correct; the other omits a letter.
Incorrect spelling - "Comon" is a misspelling.
"comon" is a common misspelling of "common". Always use "common" when referring to the correct word.
Correct spelling - The proper way to spell this word.
"Common" means usual or widespread.
"common": "Common" means usual or widespread.
This word is commonly used in everyday conversation and writing.
"Correct:" It is common knowledge.
"Correct:" This is a common mistake.
"Incorrect:" A comon error.
"Incorrect:" This is very comon.
A: Two.
Common always has two m’s.