The term 'eat away' can be described by four different words: ERODE (5 letters), CORRODE (7 letters), FRET (4 letters), and GNAW (4 letters). ERODE means to wear away gradually, usually through the action of water, wind, or other natural elements. CORRODE means to wear away or cause damage to a material due to chemical reactions. FRET means to worry or be anxious about something. Finally, GNAW means to chew on something persistently. All of these words describe the action of eating away, either through physical or chemical means.