alocasia vs arum

alocasia and arum both are nouns.

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

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

alocasia: any plant of the genus Alocasia having large showy basal leaves and boat-shaped spathe and reddish berries
arum: any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe

Other hypernyms of alocasia include aroid.

alocasia (noun)	arum (noun)
any plant of the genus Alocasia having large showy basal leaves and boat-shaped spathe and reddish berries	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