cassava vs casava

cassava and casava both are nouns.

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

As nouns, cassava and casava are synonyms defined as:

cassava and casava: any of several plants of the genus Manihot having fleshy roots yielding a nutritious starch

cassava (noun)	casava (noun)
any of several plants of the genus Manihot having fleshy roots yielding a nutritious starch	any of several plants of the genus Manihot having fleshy roots yielding a nutritious starch
cassava root eaten as a staple food after drying and leaching; source of tapioca
a starch made by leaching and drying the root of the cassava plant; the source of tapioca; a staple food in the tropics