A slang word meaning error means-something bad you have done like me saying " mate you have just made a awful error
Mistake
A word that has the same meaning as another word is a synonym.
Same word and same meaning
right
An adjective meaning free from error could be flawless or perfect.
Bent has the same meaning.
The root word for erroneous is 'err', meaning to make a mistake or an error.
Base word and root word have the same meaning but are there are different ways to say it.
The related link in section 2.4.1 has a good explanation of error which is: "Error is defined as the difference between an individual result and the true value".
error
warped, distorted.