comment: >
  
  Metonym isn't a synonym for synonym, as other mentioned it's a word used to respresent a bigger object of which it's a part. Other suggestions as "similar" or "substituable" may not be really considered as synonyms because they are less specific than "synonym" which applies specifically on words. Spoon and fork are substituables but not synonyms, for example. "Similar" is even less precise, synonyms have equivalent semantic, while two shoes can also be similar.
  A good candidate for a "synonym" synonym would be homosemic (almost litterally "same" and "sense").
  But etymologicaly synonym would mean something like "in accordance with the noun". So "poecilonym" would be the closest to "synonym" if we follow etymology, but if we use the current sense of synonym, as other said, "poecilonym" is a poecilonym of "synonym".
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  So, synonym is the antonym of antonym, and antonym is the antonym of synonym. >
  
  Stop the English, I want to get off. >
  
  They're displaying their logic there. >
  
  You fight wars for peace, but you don't maintain peace for wars. >
  
  war is peace! >
  
  Freedom is slavery... >
  
  Ignorance is strength... >
  
  Errm ackshually an example of a synonym's synonym would be "metonym" ☝️🤓 >
  
  How is this so high? Metonym and synonym are not synonymous terms.
  Metonyms are when a whole can be referred to by one of its characteristics or parts (e.g. calling your car "my wheels", referring to soldiers as "boots", etc.)
  Any specific Metonym will be a synonym to the original thing it refers to, but that doesn't make the term metonym a synonym for synonym.
  Poecilonym would be the closest to a synonym synonym, but even thats not a true synonym for synonym, just almost a synonym, making poecilonym a poecilonym of synonym. >
  
  synonym. noun. syn·​onym. ˈsin-ə-ˌnim. : a word having the same or almost the same meaning as another word in the same language. >
  
  That would make Poecilonym a synonym then, although I'm not sure it is still used. But it still doesn't make a metonym a synonym as they still have key distinctions >
  
  Tried looking this up in my thesaurus. But it’s terrible. In fact it’s so terrible, that it’s also bad >
  
  Duplicate, carbon copy, analogue, copy, counterpart, replica, and analog. >
  
  Most of the hose aren't synonyms for synonym, but some are close. So, imo, your point stands. >
  
  Eww I don’t like that nooooo! I never thought that before and now I do😭 >
  
  This comments thread reads like Sphinx script in Mystery Men. >
  
  In German there is 'Teekesselchen' which is a synonym for teapot and synonym. >
  
  Synonym sugar on toast is is tasty.  Or is this not exactly or nearly the same of of what we are talking about? >
  
  Wouldn't "homologue" be pretty close to a synonym for "synonym"? >
  
  Reminds me of the two people who guard a crossroads; one always tells the truth, one always lies. >
  
  4 synonyms for “synonym” right off the top of my head
  1) Metonym
  2) Alike
  3) Equivalent
  4) Substitutable