Comment itty bitty challenge (Score 0) 33
hmm the only challenge I could see out of this was to figure out words that were used in one book but not in the others. While that's pretty easy for the Silmarillion and Hobbit, the individual LoTR books are harder.
Off the top of my head:
Silmarillion: maiar
Hobbit: Gloin
FoTR: Goldberry
RoTK: pyre (!)
hmm I can't get anything off the top of my head for TT. Tried Treebeard, Orthanc but oh well.