The term 'brittle confectionery' refers to a type of food that is hard and crunchy. TOFFEE, a 6-letter word, is a type of candy made from sugar, butter, and sometimes nuts. GINGERSNAP, a 10-letter word, is a type of cookie made with ginger and molasses. Oatcake, a 7-letter word, is a type of flatbread made with oats. STIFF, a 5-letter word, is an adjective used to describe something that is rigid or inflexible. All of these words are related to the term 'brittle confectionery, ' as they all refer to foods that are hard and crunchy.