HSK 6
母语
mǔyǔ名
native language; mother tongue; (linguistics) parent language
中文不是她的母语。
Zhōng wén bú shì tā de mǔ yǔ.
Chinese is not her native language.
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Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 6.