Cognate

Belonging to, or derived from, the same family, root, or origin.

Biblical Hebrew, e.g., is one language out of a family of related Semitic languages, including Aramaic, Arabic, Amharic, Akkadian, Babylonian and Assyrian . Words derived from the same root are said to be cognates. Cognates are important especially in helping specialist to understand the meaning of rare words or loan words (words borrowed from another language).