I agree that compound words are hard to find.  However, I wouldn't agree that palmtop and taproom are common words.  They're not common to me, at least.  I did get palmtop, but not taproom.  I've actually never heard the word before.

Found by only 27 of 336 players in yesterday's 10 letter puzzle.  It's certainly not common to me!

Not accepted in yesterday's standard puzzle.  An energist is an adherent to the philosophy of energism, a concept in ethics in which self-realisation is the highest good (according to dictionary.com)  It's also the adjectival form of energism.  I'm not sure if energism is accepted in Chi.  If not, I'd suggest including it too.  Both, of course, are rare words.

Chid, corse and sith are all accepted in Chi as rare words.  I think alarum is too.  I can't remember seeing any of the others.

Both words appeared in yesterday's Challenge puzzle.  Tangoed was common, tangoes was rare.  That seems anomalous to me.  Shouldn't they both be classified the same?

I also love Douglas Adams' work.  The Dirk Gently books were also very funny.  I remember being outraged that his final novel, The Salmon of Doubt, was published unfinished an obscenely short time after Adams' untimely early death.  I've never read it for that reason.

MK, I remember you saying once before that you have another Chi alter ego - Klaatu.  I haven't seen him for a long while, so I'm assuming he's returned to his home planet.   

He does have periodic short absences from the game, so no need to worry unduly.

I thought this might have been the second ten letter word in yesterday's puzzle, but it was not allowed, despite being in several dictionaries.  Here's the definition from one of them:

workstream/ (ˈwɜːkˌstriːm) /

noun
commerce any one of the areas of activity into which a company’s business may be divided.