poecilonym

noun2

1. •
   (rare) Any of several names for a thing; an alternative name.

   • It's high time I looked for another job and got as far away from homonyms, synonyms, antonyms — to say nothing of caconyms, eponyms, and poecilonyms! — 2006
2. •
   Synonym of hybridism.

   • This is also a type of poecilonym or hybrid word; cf. such a word as “aeneolithic” (=chalcolithic) in English. — 1977