clod [clods](lump of something, especially of earth or clay) noun [UK: klɒd] [US: ˈklɑːd]
cube [cubes](object more or less in the form of a cube) noun [UK: kjuːb] [US: ˈkjuːb]I'd like three sugar cubes in the milk. = Quiero tres terrones de azúcar en la leche.
lump [lumps](small, shaped mass of sugar) noun [UK: lʌmp] [US: ˈləmp]