To add some to the confusion the French use 'semoule' for coursely grinded wheat flour and finely grinded rice and potatoe flour. For finely grinded wheat flour they use 'farine'.
Farine de maïs is not polenta (that would be semoule de maïs), but maïs starch and 'fleur de farine' is a very fine type of wheat flour.
I will spare you the dutch confusion. grin