octoroon vs. mulatto

octoroon

[ok-tuh-roon] / ˌɒk təˈrun /

noun

Older Use: Offensive.

a person having one-eighth Black ancestry, with one Black great-grandparent; the offspring of a quadroon and a white person.

mulatto

[muh-lat-oh, -lah-toh, myoo-] / məˈlæt oʊ, -ˈlɑ toʊ, myu- /

mulattoes, mulattos

Anthropology. (not in technical use) the offspring of one white parent and one Black parent.
Older Use: Offensive. a person who has both Black and white ancestors.