“Mother tongue” in Japanese
Short answer
Mother tongue in Japanese is “母語” (bogo). Full meaning: mother tongue, native language; protolanguage, parent language.
Other ways to say “Mother tongue” in Japanese
島言葉
shimakotoba island language, island dialect; mother tongue (from the island where one was raised); Okinawan neologism (developed by the language revival movement)
母国語
bokokugo language of one's country, mother tongue, native language
島くとぅば
shimakutuba island language, island dialect; mother tongue (from the island where one was raised); Okinawan neologism (developed by the language revival movement)
島クトゥバ
shimakutuba island language, island dialect; mother tongue (from the island where one was raised); Okinawan neologism (developed by the language revival movement)
国語
kokugo national language; Japanese language (esp. as a school subject in Japan); one's native language, mother tongue
シマ言葉
shimakotoba island language, island dialect; mother tongue (from the island where one was raised); Okinawan neologism (developed by the language revival movement)
シマクトゥバ
shimakutuba island language, island dialect; mother tongue (from the island where one was raised); Okinawan neologism (developed by the language revival movement)
國語
kokugo national language; Japanese language (esp. as a school subject in Japan); one's native language, mother tongue
こくご
kokugo national language; Japanese language (esp. as a school subject in Japan); one's native language, mother tongue
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