What is a basic word part that comes from another language?

The basic word part that comes from another language is typically referred to as a root. Roots often derive from Latin, Greek, or other languages and serve as the foundation for building words. However, it's important to note that prefixes and suffixes (which are also parts of words) can also come from other languages but are generally types of affixes. In the context of the question, root would be the most fitting answer.