aminoalkane vs ptomaine

aminoalkane and ptomaine both are nouns.

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

As nouns, ptomaine is a hyponym of aminoalkane; that is, ptomaine 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
ptomaine: 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, ptomain.

aminoalkane (noun)	ptomaine (noun)
a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals	a term for food poisoning that is no longer in scientific use; food poisoning was once thought to be caused by ingesting ptomaines
	any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria