brucine vs plant toxin

brucine and plant toxin both are nouns.

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

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

brucine: a bitter alkaloid poison resembling strychnine and extracted from nux vomica
plant toxin: any substance produced by plants that is similar in its properties to extracellular bacterial toxin

Other hypernyms of brucine include alkaloid, phytotoxin.

brucine (noun)	plant toxin (noun)
a bitter alkaloid poison resembling strychnine and extracted from nux vomica	any substance produced by plants that is similar in its properties to extracellular bacterial toxin