sociolect; social dialect
mainland dialects (of Japanese, as opposed to the Ryukyu languages)
dialect continuum; dialect chain
Okinawan (language); Okinawan dialect
center versus periphery theory
center versus periphery theory
new dialect; new regional dialect
dialectal kanji; kanji only used in a specific region
number of dialectal versions of a word
Hachijō dialects; Hachijō language
nayashi dialect (spoken in Nagano, Yamanashi and Shizuoka prefectures)