Phonological is a technical term used primarily in linguistics to describe the study of the sound structure of language. There are several synonyms for phonological, including phonemic, acoustic, and auditory. Phonemic refers to the smallest unit of sound that can distinguish one word from another in a particular language. Acoustic describes the physical properties of sound waves, including frequency, amplitude, and duration. Auditory refers specifically to the perception of sound by the human ear and brain. Other potential synonyms for phonological might include linguistic, sound-based, or even linguistic sound-based, depending on the context in which the term is used.