Advance stealthily is an action that involves moving slowly and quietly in order to avoid detection. This can be done by using the words WORM, CREEP, and TIPTOE. WORM is a four letter word meaning to move slowly and smoothly like a snake. CREEP is a five letter word meaning to move slowly and cautiously, often with the intention of avoiding detection. TIPTOE is a six letter word meaning to walk on one's toes in order to make as little noise as possible. All three words describe the action of advancing stealthily.