aminoalkane vs ptomain

aminoalkane and ptomain both are nouns.

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

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

aminoalkane: a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals
ptomain: any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria

Other hyponyms of aminoalkane include histamine, aminobenzine, aniline, aniline oil, phenylamine, enamine, monoamine, ptomaine.

aminoalkane (noun)	ptomain (noun)
a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals	any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria