green dragon vs arum

green dragon and arum both are nouns.

Word	Noun	Adjective	Verb	Adverb
green dragon	Yes	No	No	No
arum	Yes	No	No	No

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

green dragon: early spring-flowering plant of eastern North America resembling the related jack-in-the-pulpit but having digitate leaves, slender greenish yellow spathe and elongated spadix
arum: any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe

Other hypernyms of green dragon include aroid.

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

green dragon: European arum resembling the cuckoopint
arum: any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe

Other hypernyms of green dragon include aroid.

green dragon (noun)	arum (noun)
early spring-flowering plant of eastern North America resembling the related jack-in-the-pulpit but having digitate leaves, slender greenish yellow spathe and elongated spadix	any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe
European arum resembling the cuckoopint	starch resembling sago that is obtained from cuckoopint root