cambridge dictionary - a small, flat cake that is dry and usually sweet
dictonary.com - a kind of bread in small, soft cakes, raised with baking powder or soda, or sometimes with yeast; scone
chiefly british, a dry and crisp or hard bread in thin, flat cakes, made without yeast or other raising agent; a cracker. a cookie
collins - a biscuit is a small flat cake that is crisp and usually sweet
merriam - a small quick bread made from dough that has been rolled out and cut or dropped from a spoon
so by consensus a biscuit is a 'cake' then?