Groats is крупа́. Ка́ша is the food made by boiling groats, millet or rice in water or in milk.
December 3, 2015
oatmeal is вівсяна каша or вівсянка. You can cook каша with any type of cereal
January 23, 2016
I believe this should be accepted too.
January 15, 2016