I think a good analogy is imported cheese. It's still Italian cheese even if you grew up with mozzarella as an American and consider pizza an American food. So while these words might be completely familiar to an English speaker you are still using a foreign word and are speaking and understand a very tiny bit of a foreign language. I know a tiny bit of German thanks to kindergarten. A word my Austrian friend spoke in a German sentence this morning while speaking with his son. My very tiny set of German vocabulary along with the context made it easy enough to figure out where they are headed today.