-- See Also the narrower term Distinctive features (Linguistics) 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.
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-- See Also the narrower term Grammar, Comparative and general Here are entered: 1. Works comparing and classifying the grammatical structure of genetically unrelated languages or groups of languages; 2. Works in which the principles of grammar in general are discussed, i.e. general, philosophical or universal grammar. Works which present a specific comparison of the grammars of two or more languages or groups of languages are entered under the name of the language, with the subdivision Grammar, Comparative, e.g. 1. Slavic languages--Grammar, Comparative; or, 1. Russian language--Grammar, Comparative--English. 2. English language--Grammar, Comparative--Russian; or, 1. Slavic languages--Grammar, Comparative--Germanic. 2 Germanic languages--Grammar, Comparative--Slavic. --subdivision Grammar, Comparative under names of languages