The term 'language related to Hopi' can be answered by two crossword solutions: AZTEC (5 letters) and UTE (3 letters). The AZTEC language is a Nahuatl language, which is the language of the Aztecs, an indigenous people of Mexico. It is still spoken today by over 1.5 million people. Ute is an indigenous language of the Ute people, who are native to the Great Basin region of the United States. It is currently endangered, with only a few hundred speakers left.