caladium vs arum

caladium and arum both are nouns.

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

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

caladium: any plant of the genus Caladium cultivated for their ornamental foliage variously patterned in white or pink or red
arum: any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe

Other hypernyms of caladium include aroid.

caladium (noun)	arum (noun)
any plant of the genus Caladium cultivated for their ornamental foliage variously patterned in white or pink or red	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