As nouns the difference between oatmeal and sorghum
is that
oatmeal is meal made from rolled or round oats while
sorghum is a cereal, species: Sorghum vulgare or
Sorghum bicolor, the grains of which are used to make flour and as cattle feed.
As an adjective oatmeal
is of a light greyish brown colour, like that of oatmeal.