List of Collective Unit Nouns:

1. ball
   1. a ball of paper
2. bit
   1. a bit of cake
   2. a bit of fun
   3. a bit of luck
   4. a bit of wood
3. chunk
   1. a chunk of cheese
   2. a chunk of chocolate
   3. a chunk of concrete
4. fragment
   1. a fragment of paper
5. grain
   1. a grain of corn
   2. a grain of dust
   3. a grain of salt
   4. a grain of sand
6. heap
   1. a heap of clothes
   2. a heap of rubbish
7. item
   1. an item of clothing
   2. an item of equpment
   3. an item of news
8. length
   1. a length of paper
9. loaf
   1. a loaf of bread
10. lump
    1. a lump of butter
    2. a lump of clay
    3. a lump of coal
    4. a lump of fat
    5. a lump of soil
11. mound
    1. a mound of paper
12. piece
    1. a piece of advice
    2. a piece of cake
    3. a piece of chalk
    4. a piece of evidence
    5. a piece of land
    6. a piece of toast
    7. a piece of wood
13. pile
    1. a pile of paper
14. rasher
    1. a rasher of bacon
15. roll
    1. a roll of paper
16. scrap
    1. a scrap of paper
17. sheet
    1. a sheet of cardboard
    2. a sheet of iron
    3. a sheet of paper
18. slice
    1. a slice of bread
19. speck
    1. a speck of dirt
20. strip
    1. a strip of cloth
21. wad
    1. a wad of paper