Lexical root? Perhaps.
supreme (adj.)
1520s, from Middle French suprême (15c.) and directly from Latin supremus "highest," superlative of superus "situated above," from super "above" (from PIE root *uper "over"). Supreme Being "God" first attested 1690s; Supreme Court is from 1689.
https://www.etymonline.com/word/supreme
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Root
Linguistics
A root (or root word) is a word that does not have a prefix in front of the word or a suffix at the end of the word. The root word is the primary lexical unit of a word, and of a word family (this root is then called the base word), which carries the most significant aspects of semantic content and cannot be reduced into smaller constituents. Content words in nearly all languages contain, and may consist only of, root morphemes. However, sometimes the term "root" is also used to describe the word minus its inflectional endings, but with its lexical endings in place. For example, chatters has the inflectional root or lemma chatter, but the lexical root chat. Inflectional roots are often called stems, and a root in the stricter sense may be thought of as a monomorphemic stem.
https://en.wikipedia.org/wiki/Root_(linguistics)