So let me explain it better.
Motorcycle comes from the LATIN word movere, motus that means movement and the GREEK word κύκλος (kuklos) than means circular.
Automobile comes from the LATIN word movere, motus, same as above and da GREEK word αὐτός (autos) than means self, same.
I just cut the words down to the, let's say more common English so i can blend with the natives here.
So you just have been educated.