ptomain vs cadaverine

ptomain and cadaverine both are nouns.

Word	Noun	Adjective	Verb	Adverb
ptomain	Yes	No	No	No
cadaverine	Yes	No	No	No

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

ptomain: any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria
cadaverine: a colorless toxic ptomaine with an unpleasant odor formed during the putrefaction of animal tissue

Other hyponyms of ptomain include putrescine.

ptomain (noun)	cadaverine (noun)
any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria	a colorless toxic ptomaine with an unpleasant odor formed during the putrefaction of animal tissue