Superior: Up/above along the axis of upright posture (upwards in standard anatomical position). This is also called “Cranial” or sometimes “Cephalic”.
Inferior: Down/below along the axis of upright posture. This is equivalent to “Caudal”.
Cephalic comes from the Greek word κεφάλι which means head.
Cranial comes from κρανίο, which means skull.