There are several synonyms for the word "basils" that denote similar herbs. The first synonym for basil is "sweet basil," which is the most common type of basil that is used in cooking and often found in tomato sauces. The second synonym is "holy basil," which is also known as tulsi and is a sacred plant in Hindu culture. The third synonym is "Thai basil," which has a spicy flavor and is commonly used in Asian dishes. Lastly, "lemon basil," which has a citrusy smell and taste, is used for aroma in culinary dishes and some cocktails. These are the most popular synonyms of basil.