WAnatolian hypothesis
WArmenian hypothesis
WCenter versus periphery
WCognate
WComparative method
WEurolinguistics
WInkhorn term
WIsogloss
WFrede Jensen (philologist)
WJespersen's Cycle
WKurgan hypothesis
WLanguage death
WLanguage family
WPaleolithic Continuity Theory
WPre-Indo-European languages
WProto-language
WReappropriation
WRosetta Project
WHerbert Schendl
WTree model
WVasconic substrate hypothesis
WWave model