It is not the vocabulary but the origin of the language itself and its grammatical structure that determine which language family a language is in. You can swap out the entire English vocabulary and replace it with words from another language without changing the grammar and it would still be considered a Germanic language. Also note that the vast majority of the most commonly used and basic words in English are in fact of Germanic origin. Japanese is not considered to be a “dialect”/regional language of Chinese for the same reason.
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