00670 - cereal and cereal-like flours (efsa foodex2)
00760 - oat flour (efsa foodex2)
http://langual.org
http://www.langual.org/langual_thesaurus.asp?termid=A002Y
The group includes any type of Oat flour (finely milled grains with particles not easy to distinguish). Different grades of refinement and types are all included in this group. The part consumed/analysed is by default the whole or a portion of it representing the observed heterogeneity. ] and [https://en.wikipedia.org/wiki/flour] and [https://www.google.co.uk/search?tbm=isch&q=Oat+flour]
requires discussion