mandioc vs casava

mandioc and casava both are nouns.

Word	Noun	Adjective	Verb	Adverb
mandioc	Yes	No	No	No
casava	Yes	No	No	No

As nouns, casava is a hypernym of mandioc; that is, casava is a word with a broader meaning than mandioc:

mandioc: cassava with long tuberous edible roots and soft brittle stems; used especially to make cassiri (an intoxicating drink) and tapioca
casava: any of several plants of the genus Manihot having fleshy roots yielding a nutritious starch

Other hypernyms of mandioc include cassava.

mandioc (noun)	casava (noun)
cassava with long tuberous edible roots and soft brittle stems; used especially to make cassiri (an intoxicating drink) and tapioca	any of several plants of the genus Manihot having fleshy roots yielding a nutritious starch