polynym

noun4

1. •
   A name (or term) consisting of multiple words.

   • They agree upon one point, viz., the advantages, other things being equal, of mononyms (single word terms) over polynyms (terms consisting of two or more words). — 1890
2. •
   One of multiple names for the same thing.

   • Dyaus, the Bright- Shining-One-in-the-Heavens, or Maruna, the All-Surrounding, All- Enduring-One ; or Agni, the Everywhere-Present-One, became the polynyms for God. — 1893
3. •
   A single word or name with multiple distinct (although possibly related) meanings.

   • A few dictionaries have treated all the meanings sub-meanings of a polynym under one entry. — 1986
4. •
   A word that is spelled the same as another, but which has a different pronunciation and meaning; homograph.

   • ) We have also furnished a list of polynyms, partly from the same source, and partly from Worcester's Dictionary, in Table IX in the Appendix, but we fear that it is not very complete. — 1848