The word "step-" is commonly used as a prefix in many words to refer to an action or movement. Some synonyms for the word "step-" include: stride-, move-, march-, tread-, walk-, and advance-. These words are often used interchangeably, but can also carry different connotations. For example, "stride-" implies a confident and purposeful movement, while "tread-" suggests a cautious and careful movement. Additionally, "march-" is often used in a military context, while "walk-" is a more casual term. Regardless of the synonym used, the prefix "step-" emphasizes that the action being referred to involves movement of some kind.