The word piquantness is generally used to refer to something that has a spicy, tangy, or stimulating flavor. While there are no direct synonyms for this word, there are several words that capture the essence of piquantness. For example, the word zestiness can be used to describe a food or drink with a lively and refreshing flavor. If you are looking for a more vibrant and intense word, you can use the term spiciness to describe a dish with bold and fiery notes. Other possible synonyms can include tanginess, pep, liveliness, zing, and vigor. Overall, piquantness is a versatile word that can be used to describe a range of flavors and sensations.