hyoscine vs alkaloid

hyoscine and alkaloid both are nouns.

Word	Noun	Adjective	Verb	Adverb
hyoscine	Yes	No	No	No
alkaloid	Yes	No	No	No

As nouns, alkaloid is a hypernym of hyoscine; that is, alkaloid is a word with a broader meaning than hyoscine:

hyoscine: an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures
alkaloid: natural bases containing nitrogen found in plants

hyoscine (noun)	alkaloid (noun)
an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures	natural bases containing nitrogen found in plants