1.  foodstuff(n = noun.artifact) grocery - (usually plural) consumer goods sold by a grocer;
is a kind of consumer goods
has particulars: greengrocery, packaged goods

2.  foodstuff(n = noun.food) food product - a substance that can be used or prepared for use as food;
is a kind of food, nutrient
has particulars: starches, breadstuff, coloring, colouring, food color, food coloring, food colour, food colouring, concentrate, meal, fiber, roughage, flour, frozen food, frozen foods, canned food, canned foods, canned goods, tinned goods, dehydrated food, dehydrated foods, carob, carob powder, saint-john's-bread, tapioca, cocoa, cereal, food grain, grain, fixings, ingredient, egg, eggs, dairy product, milk, curd, concoction, intermixture, mixture, juice, perishable, spoilable

foodstuff, n. any substance suitable as food.