Is it ensure, insure, or assure?
polytypic pol·y·typ·ic (pŏl'ē-tĭp'ĭk) or pol·y·typ·i·cal (-ĭ-kəl)
Having several variant forms, especially subspecies or varieties.
Having several variant forms, especially containing more than one taxonomic category of the next lower rank. A polytypic genus contains two or more different species, while a polytypic species consists of two or more subspecies. Compare monotypic.