[dragonwriter]

> What? Race and ethnicity are synonyms.

Race and ethnicity are, perhaps, similar kinds of cultural constructs, but they are orthogonal categories.

See, e.g., https://nces.ed.gov/ipeds/reic/definitions.asp

[Nadya]

> The categories do not denote scientific definitions of anthropological origins

[dragonwriter]

Yes, neither "race" nor "ethnicity" do denote scientific definitions of anthropological origins.

They are both cultural in-group, out-group constructs, they just happen to be different constructs rather than synonyms.