The word "dayz" is typically used as an abbreviation for the video game "DayZ," which is a popular survival game set in a post-apocalyptic world. However, there are several synonyms that can be used to describe similar games or experiences. For instance, "survival games" or "zombie games" are often used to describe games that involve similar themes and gameplay. "Open-world games" can also be used to describe games that provide players with freedom to explore their surroundings and make their own choices. Other synonyms might include "roguelike games," "sandbox games," or "MMORPGs," depending on the specific features and gameplay mechanics of the game being discussed.