tubocurarine vs alkaloid

tubocurarine and alkaloid both are nouns.

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

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

tubocurarine: a toxic alkaloid found in certain tropical South American trees that is a powerful relaxant for striated muscles
alkaloid: natural bases containing nitrogen found in plants

Other hypernyms of tubocurarine include neuromuscular blocking agent, phytotoxin, plant toxin.

tubocurarine (noun)	alkaloid (noun)
a toxic alkaloid found in certain tropical South American trees that is a powerful relaxant for striated muscles	natural bases containing nitrogen found in plants