strychnine vs alkaloid

strychnine and alkaloid both are nouns.

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

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

strychnine: an alkaloid plant toxin extracted chiefly from nux vomica; formerly used as a stimulant
alkaloid: natural bases containing nitrogen found in plants

Other hypernyms of strychnine include phytotoxin, plant toxin.

strychnine (noun)	alkaloid (noun)
an alkaloid plant toxin extracted chiefly from nux vomica; formerly used as a stimulant	natural bases containing nitrogen found in plants