00670 - cereal and cereal-like flours (efsa foodex2)
00720 - maize, milled (efsa foodex2)
http://www.langual.org/langual_thesaurus.asp?termid=A0C0Z
http://langual.org
The group includes any type of milled maize (milled corn). Different grades of refinement and types are all included in this group, from fine to coarse. The part consumed/analysed is by default the whole or a portion of it representing the observed heterogeneity. ] and [https://www.google.co.uk/search?tbm=isch&q=Maize+milled]
requires discussion