Here are entered works which describe the functional differentiation of one linguistic unit from another. The term is usually applied in phonology, where phonemes may be defined in terms of groups of specific phonetic properties, such as voice; or acoustic criteria, such as sonority.
--subdivision Vowels under names of languages, e.g. English language--Vowels; and subdivision Vocalization under names of Semitic languages, e.g. Hebrew language--Vocalization
