tapioca plant vs casava

tapioca plant and casava both are nouns.

Word	Noun	Adjective	Verb	Adverb
tapioca plant	Yes	No	No	No
casava	Yes	No	No	No

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

tapioca plant: 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 tapioca plant include cassava.

tapioca plant (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