misnominal

adj

1. (rare)Being a misnomer.

   “.For a similar reason many of the peninsulas are named islands. Is not this feature peculiar to Irish nomenclature? By no means. "Portland Isle" in Dorsetshire (South England) is no island at all: and ''gulf," in the nomenclature of southern Europe, is frequently a misnomer of this description. Every language has little misnominal vagaries […]”

   “The varied enumeration of these Official titles is either fallacious or misnominal.”

   “However, since the substance is not derived from a rice plant, the court acknowledged that the use of the word "rice" in connection with it could be considered misnominal.”