strychnine vs plant toxin

strychnine and plant toxin both are nouns.

Word	Noun	Adjective	Verb	Adverb
strychnine	Yes	No	No	No
plant toxin	Yes	No	No	No

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

strychnine: an alkaloid plant toxin extracted chiefly from nux vomica; formerly used as a stimulant
plant toxin: any substance produced by plants that is similar in its properties to extracellular bacterial toxin

Other hypernyms of strychnine include alkaloid, phytotoxin.

strychnine (noun)	plant toxin (noun)
an alkaloid plant toxin extracted chiefly from nux vomica; formerly used as a stimulant	any substance produced by plants that is similar in its properties to extracellular bacterial toxin