When you have a group of people or things and one stands out as being different, we often use the phrase "odd man out". However, there are many other great synonyms that can be used to describe this situation. For example, we could use the terms "misfit", "outsider", "black sheep", "exception", "anomaly", "deviant" or "oddity". Each of these words suggests that something or someone does not fit into a particular group, whether it be because of their actions, appearance, or beliefs. Overall, if you want to add an extra layer of nuance to your writing or speech, it is worthwhile to explore the many great synonyms for the phrase "odd man out".