The phrase "playing gods" conveys the idea of someone behaving arrogantly or taking excessive power. There are several synonyms that could be used to describe this kind of behavior. One could say that such a person is "playing dictator," or acting like a tyrant. Alternatively, one could describe the person as being "overbearing" or "domineering," or as someone who is "ruling with an iron fist." Other synonyms might include "bossy" or "controlling," while some might describe the person as "acting like a deity." Ultimately, these synonyms all point to someone who is trying to exert power and control over others in an excessive or abusive way.