What is the difference between corn and grain?

It's a subset, not something with a difference. Grain has many types. Corn is just one of them. read more

In context|uncountable|lang=en terms the difference between corn and grain is that corn is (uncountable) short for corn snow a type of granular snow formed by repeated melting and re-freezing, often in mountain spring conditions while grain is (uncountable) a linear texture of a material or surface. read more

"Corn," in British English, used to refer to any small item, including a single grain or even a peppercorn. The word was a mass noun when it came to grains (two tons of corn), but a unit noun when it came to other items (peppercorns). read more

In the Bible, corn is nothing but wheat and barley. In USA and Canada corn and maize are one and the same, and is meant for the plant that produces kernels used for cooking. However, the term corn is preferred over maize for food products that are made from it, such as corn flour, corn starch, cornmeal etc. read more