malanga vs arum

malanga and arum both are nouns.

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

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

malanga: tropical American aroid having edible tubers that are cooked and eaten like yams or potatoes
arum: any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe

Other hypernyms of malanga include aroid.

malanga (noun)	arum (noun)
tropical American aroid having edible tubers that are cooked and eaten like yams or potatoes	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