manioc vs cassava

manioc and cassava both are nouns.

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

As nouns, cassava is a hypernym of manioc; that is, cassava is a word with a broader meaning than manioc:

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

Other hypernyms of manioc include casava.

As nouns, manioc and cassava are synonyms defined as:

manioc and cassava: cassava root eaten as a staple food after drying and leaching; source of tapioca

As nouns, manioc and cassava are synonyms defined as:

manioc and cassava: a starch made by leaching and drying the root of the cassava plant; the source of tapioca; a staple food in the tropics

Other synonyms of manioc include cassava starch, manioca.

manioc (noun)	cassava (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
cassava root eaten as a staple food after drying and leaching; source of tapioca	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	a starch made by leaching and drying the root of the cassava plant; the source of tapioca; a staple food in the tropics