dracontium vs arum

dracontium and arum both are nouns.

Word	Noun	Adjective	Verb	Adverb
dracontium	Yes	No	No	No
arum	Yes	No	No	No

As nouns, arum is a hypernym of dracontium; that is, arum is a word with a broader meaning than dracontium:

dracontium: any plant of the genus Dracontium; strongly malodorous tropical American plants usually with gigantic leaves
arum: any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe

Other hypernyms of dracontium include aroid.

dracontium (noun)	arum (noun)
any plant of the genus Dracontium; strongly malodorous tropical American plants usually with gigantic leaves	any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe
	starch resembling sago that is obtained from cuckoopint root