You should, in theory, know how to spell the following words. Yet they seem to be misspelled pretty often. Test your knowledge below. Then challenge a friend, relative or co-worker. Good luck!

About this story Most commonly misspelled words were identified by the Oxford University Press. A version of this story was originally published May 29, 2014, by Emily Chow and Kat Downs Mulder.

A. Principle For example, it probably goes against your “principles” to cheat on a test of 4th grade spelling words—and it just might get you sent to the “principal’s” office.

How well can you fare without autocorrect, relying purely on your mastery of the English language? Keep reading to test your knowledge of these 30 simple words that are often misspelled.

This data is based on visitors to Spelling Bee Buddy, a tool that shows hints and statistics for each word as you play Spelling Bee, and covers Saturday, June 10, to Friday, June 16.

Last year, with no vocabulary test, 40 of 245 kids made it past the written spelling exam. The written spelling test, which was 50 words long in 2013, was cut to 30 words this year.

Nupur Lala, 14, from Tampa, Fla., reacts to winning the 72nd annual National Spelling Bee after correctly spelling "logorrhea" on June 3, 1999 in Washington. Ron Edmonds—AP ...