The term 'with caution' can be expressed in a variety of ways, such as warily (6 letters), safely (6 letters), USE (3 letters), and GINGERLY (8 letters). Warily means to be on guard or to be cautious, while safely implies taking precautions to avoid danger. USE suggests to employ something with care, and GINGERLY implies to move carefully or cautiously. All of these words indicate that one should take caution when performing an action.