Originally the "planets" were "stars" that "traveled". Most stars were fixed.
According to Ptolemy's Almagest, technically all stars are wandering (planets) because of the precession of the constellations.
''Here too it would be appropriate to deal first with the sphere of the so-called ‘fixed stars’, and follow that by treating the five ‘planets’, as they are called.'' - Ptolemy, Almagest. Translated by Toomer.
He calls both non-wandering stars and planets ''so-called'' since he observed an annual motion in addition to their daily rotation relative to the earth with both.