[merlight]

Originally Posted by @AlphaLemming I will try it this way (not yet tested): for x, name in pairs(namedata) do         for y, base in pairs(basedata) do             if name == base then table.remove(namedata,x); table.remove(basedata,y); break end         end     end end

This won't work because table.remove shifts indices, and you will skip the next value (edit: removed incorrect info; you can delete table values during traversal). Anyway you don't need 2 nested loops. Assuming the 0-level name has fewer words, you can:

local i = #basedata
for j = #namedata, 1, -1 do
    if namedata[j] == basedata[i] then
        table.remove(namedata, j)
        i = i - 1
    end
end