narkotaĵo

Decode it, because the pieces tell you the register. Narkoti is to induce narcosis, to put somebody under with a drug - what an anaesthetist does. -Aĵ- is the suffix for a concrete thing made of, or produced by, the root. A narkotaĵo is therefore the substance that does the numbing, named by its pharmacological action rather than by its street value. That is the whole difference between this word and the one you met at rank 1,821.

The trio, and it is worth getting exactly right. The drogo page sets out the split English does not make, and this word is the third leg of it.

• Medikamento - what a doctor prescribes and a pharmacist dispenses. The hospital word.
• Drogo - the street word. A narcotic in the crime, addiction and public-health sense. Drogaĉo, with the pejorative -aĉ-, is the addict's substance specifically.
• Narkotaĵo - the clinical and legal word. It is what an anaesthetist gives you before surgery and it is what the statute is called. Neither approving nor condemning: a classification.

Translate by the situation, never by the letter. A newspaper headline about a seizure wants drogoj; the schedule of controlled substances in the law wants narkotaĵoj; the anaesthetist's chart wants narkotaĵo too, and there is no contradiction in that, because the legal category was drawn round the pharmacological one.

The rest of the family. Narkozo is the state of being under, general anaesthesia. Narkotilo is the same thing as narkotaĵo seen as an instrument rather than a substance. Narkotulo and narkotaĵemulo are words for an addict, though most modern writing says drogulo or droguzanto. Anestezi is the narrower medical verb and dormigi, to make sleep, is the plain Esperanto way of saying it with no borrowed root at all.