Citrus sudachi is a small, round, green fruit that's originated from Japan. It is commonly used in Japanese cuisine and has a strong, sour, and tangy flavor, making it a popular ingredient for sauces, dressings, and marinades. If you're looking for synonyms for the word "citrus sudachi," you might consider other sour fruits like lime, lemon, or grapefruit. However, each fruit has its own unique flavor and acidity. Other options could include yuzu, a citrus fruit similar to sudachi but with a floral aroma, or calamansi, a small citrus fruit that is commonly used in Filipino cuisine. Regardless of what fruit you choose, it's essential to consider the flavor profile and how it will complement your dish.