phytotoxin vs brucine

phytotoxin and brucine both are nouns.

Word	Noun	Adjective	Verb	Adverb
phytotoxin	Yes	No	No	No
brucine	Yes	No	No	No

As nouns, brucine is a hyponym of phytotoxin; that is, brucine is a word with a more specific, narrower meaning than phytotoxin:

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

Other hyponyms of phytotoxin include nicotine, strychnine, hemlock, mycotoxin, curare, tubocurarine.

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