mycotoxin vs plant toxin

mycotoxin and plant toxin both are nouns.

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

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

mycotoxin: a toxin produced by a fungus
plant toxin: any substance produced by plants that is similar in its properties to extracellular bacterial toxin

Other hypernyms of mycotoxin include phytotoxin.

mycotoxin (noun)	plant toxin (noun)
a toxin produced by a fungus	any substance produced by plants that is similar in its properties to extracellular bacterial toxin