if Tungusic and Mongolic similarity is just because of adoption, are Mongolic and Turkic related (from one root). But Mongolian changed later and changed much more after Tungusic adoption.
Today Tungusic and Mongolic are much more similar than Turkic and Mongolic similarity. What about old Xianbei Mongolic language and Khüis Tolgoi Mongolic language. were they also similar to Tungusic? or were they similar to Turkic.
http://nek.istanbul.edu.tr:4444/ekos/TEZ/ET002794.pdf a research (80 common words among Turkic and Mongolic on old stone inscriptions).
http://atalarmirasi.org/tr/17-h%C3%BCis-tolgoy-i-ii-bitig-ta%C5%9Flar%C4%B1ndaki-brahmi-yaz%C4%B1l%C4%B1-metinler Khüis Tolgoi inscriptions.
there are much more common words but these 80 words are only on old inscriptions. Here are also similar suffixes with same meanings.
linguists require basic words to be common numbers are not same.except 4. 1000 is also similar but linguists accept only 1-10 basic numbers similarity .