Casava and Mandioca

Casava noun - Any of several plants of the genus Manihot having fleshy roots yielding a nutritious starch.

Mandioca and casava are semantically related. In some cases you can replace term "Mandioca" with "Casava", this nouns are similar.

Mandioca noun - Cassava with long tuberous edible roots and soft brittle stems; used especially to make cassiri (an intoxicating drink) and tapioca.

Casava and mandioca are semantically related. You can use "Casava" instead a noun "Mandioca".