@pleonasm - As long as you're willing to laugh it off, most mistakes like this can be easily rectified. If you're at the stage where you're confusing words like that then you've probably got a dictionary handy anyway.
Language transfer can be extremely helpful if it's used deliberately, even when the languages aren't related. Your mind wants to make connections and the problem with learning a new language is there are a lot of things to memorize at first without many connections to what you already know. If you can come up with some ways of relating new words to what you do know, even if they mean the opposite to what you'd expect, or the meaning is funny in some way, then you're much more likely to remember them.