Alkaloid and Hyoscine

Alkaloid noun - Natural bases containing nitrogen found in plants.

Hyoscine and alkaloid are semantically related. In some cases you can replace term "Hyoscine" with "Alkaloid", this nouns are similar.

Hyoscine noun - An alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures.

Alkaloid and hyoscine are semantically related. You can use "Alkaloid" instead a noun "Hyoscine".