casava vs cassava

casava and cassava both are nouns.

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

As nouns, casava and cassava are synonyms defined as:

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

casava (noun)	cassava (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