ptomaine vs food poisoning

ptomaine and food poisoning both are nouns.

Word	Noun	Adjective	Verb	Adverb
ptomaine	Yes	No	No	No
food poisoning	Yes	No	No	No

As nouns, food poisoning is a hypernym of ptomaine; that is, food poisoning is a word with a broader meaning than ptomaine:

ptomaine: a term for food poisoning that is no longer in scientific use; food poisoning was once thought to be caused by ingesting ptomaines
food poisoning: illness caused by poisonous or contaminated food

Other hypernyms of ptomaine include gastrointestinal disorder.

ptomaine (noun)	food poisoning (noun)
a term for food poisoning that is no longer in scientific use; food poisoning was once thought to be caused by ingesting ptomaines	illness caused by poisonous or contaminated food
any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria