§ 7.4 MINOR TYPES OF LEXICAL OPPOSITIONS. SOUND INTERCHANGE
Sound interchange may be defined as an opposition in which words or word forms are differentiated due to an alternation in the phonemic composition of the root. The change may affect the root vowel, as in food n : : feed v; or root consonant as in speak v : : speech n; or both, as for instance in life n : : live v. It may also be combined with affixation: strong a : : strength n; or with affixation and shift of stress as in 'democrat : : de'mocracy.
The process is not active in the language at present, and oppositions like those listed above survive in the vocabulary only as remnants of previous stages. Synchronically sound interchange should not be considered as a method of word-building at all, but rather as a basis for contrasting words belonging to the same word-family and different parts of speech or different lexico-grammatical groups.
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