phonocentrism
/ˌfəʊnəʊˈsɛntrɪz(ə)m/Linguistics
noun
The tendency to value speech above writing in linguistic analysis; especially the view (arising from the work of Ferdinand de Saussure) that the spoken language is the immediate realization of meaning.
Origin
1970s. From phono- + -centrism, after French phonocentrisme.