Because safety analysis is one of the corner stones in ISO-26262 software development, it is important to provide practical safety analysis techniques. FMEA is one of the most widely applied techniques in safety analysis and, thus, it is valuable to enhance its practicality. In this paper we propose the enhancement of HAZOP guide words approach for SW FMEA. The key idea behind our enhancement is the combination of the execution style of software with traditional HAZOP guide words. By this combination, it is possible to develop the more detailed set of guide words and to support more consistent identification of failure modes.