Careen means swerving from side to side and career means full speed.
The car careened wildly down the street.
The car careered down the street.
If you saw either car coming toward to you, you’d be best to get out of the way!
I don’t think these words are commonly used today, but a friend of mine notices when newspapers confuse these two words.
Improve your grammar with Online Writing Training’s online Grammar, Punctuation and Usage course.
Subscribe to my monthly e-newsletter to receive writing and grammar tips.