Australian nut, also known as Macadamia nut, is a popular ingredient in various dishes and baked goods. However, if you are allergic to this nut or want to try something different, there are several synonyms you can use as a substitute. One option is pecans, which have a nutty and buttery flavor similar to macadamia nuts. Another alternative is hazelnuts, which have a slightly different taste but can add a crunch to your dish. For those who are looking for a more exotic option, Brazil nuts and cashews can also be used as a substitute for Australian nuts.