Primary taste disorder refers to the inability to differentiate between different kinds of tastes. People with this disorder may find it difficult to recognize sweet, sour, salty, and bitter tastes. In contrast to primary taste disorder, some antonyms are the ability to recognize different tastes, including sweet, sour, salty, and bitter. Another antonym could be that these individuals have a heightened sense of taste, where they are able to detect even subtle variations in taste that others may not pick up. Additionally, an antonym of primary taste disorder could be a specific taste disorder, such as only having difficulty recognizing sweet tastes or sour tastes.