The only unserious argument here is your absurd analogy to banks. A homonym is when two words have totally unrelated meanings. Cocaine is the psychoactive drug

The only unserious argument here is your absurd analogy to banks. A homonym is when two words have totally unrelated meanings. Cocaine is the psychoactive drug found in coca leaves; we refer to cocaine hydrochloride (i.e. powder cocaine) as “cocaine” for the same reason we refer to Everclear as “grain alcohol”.