Many clearly different ethnic groups may have the same mother tongue. In case of English, for instance, most nationalities with English as mother tongue would not consider themselves the same as another nationality just because they speak English also.
Language is a primary characteristic and an always present characteristic of ethnicity. Without language you would have an incomplete description of ethnicity. Language is the primary component of ethnicity. Language is tied up with our psyche, as individuals and as a society. Language is a component of thought. Thus, language is integral to worldview. Differences in worldview involve differences in thought and language.
Our Offer with various Languages throughout the world as stated bellow may help you have an idea about groups of languages provided by our agency:
People on occasion will ask me a question like, “In Kenya, does everybody speak Swahili, or do some people still speak dialects?” Notably, the speaker seems to have the idea that Swahili is a language but the other 85 languages of the 125 or so ethnicities are “dialects.” Dr. Orville Boyd Jenkins
It is somewhat amusing to occasionally run across popular writing referring to languages and dialects. This would be funny if it were not so sad. For it seems to reflect a discriminatory hierarchical idea of human speech: we rank speech forms from worse to best, or lowest to highest, and the highest forms are the “languages”