Yes, I think we could certainly take example from our definitions of "star." Look how that has evolved over the years. If we limitted stars to our "classical" understanding of our own sun, we would need a new word to represent our current meaning of star. Now look at all our modifiers and classifications of stars as we have gained knowledge with our continually expanding surveys. Eventually, some of those classifications get their own name (e.g. magnetar). So, it should go with planets, I think. There will probably be grey areas at the fuzzy areas of boundaries, because nature often works more in a continuum, than we like to acknowledge with our need (justifiably as a tool) to put things in neat classifications.