List of Collective Unit Nouns: 

1. Ball
   1. a ball of paper
2. Bit
   1. a bit of cake
   2. a bit of wood
   3. a bit o fun
   4. a bit of luck
3. Chunk
   1. a chunk of chocolate
   2. a chunk of concrete
   3. a chunk of good
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 rasher of bacon
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 clay
    2. a lump of coal
    3. a lump of soil
    4. a lump of butter
    5. a lump of fat
11. Mound
    1. a mound of paper
12. Piece
    1. a piece of cake
    2. a piece of toast
    3. a piece of chalk
    4. a piece of land
    5. a piece of wood
    6. a piece of advice
    7. a piece of evidence
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