slangonym
A slang term that is also synonymous with another word or expression.
rare, uncountable
Based on the slangonym snow, referring to heroin and cocaine. In use since early 1920's.
Where it comes from
Blend of slang + synonym or slang + -onym. First use appears c. 1959. See cite below.
Adapted from the Wiktionary entry slangonym (CC BY-SA 4.0).