I'm starting this thread for people to post questions about the pronunciation of words which may not be immediately obvious. For instance, 'Dreugh' is pronounced as 'Dreg', according to the developer who first created them. I'll update this first post with an alphabetized list as more words and agreed pronunciations are added, for the sake of consistency.
Here's where you can find a pronunciation key.
Ahemmusa: ä hĕm o̅o̅ sä
CHIM: hchkĭm (don't worry about it - you probably won't have to say it)
Chimer: Kī mər
Daedra: Dā drä (Dunmeri), Dî drə (Redguards and Khajiit), Dā drə (All other races)
Dagoth Ur: Dā gŏth ûr (acceptable for Humans); Dä gôth o̅o̅ r (Dunmer and other elves - rolling R optional)
Dunmer: Dŭn mər (acceptable for Humans); Do̅o̅ n mər (Dunmer and other elves - rolling R optional)
Greef: Grĕf (hold longer on the short e)
Hlaalu: Aspirated 'L' Hlä lo̅o̅ (accent and hold slightly longer on the first syllable - this word should only be two syllables)
Matze: Mäz tĕ
Sheogorad: Shĕ ō gōr äd
Sheogorath: Shĕ ō gōr
Sujamma: So̅o̅ jäm mä
Vivec: Vĭ vĕk (accent on the 'vek' part)
Vvardenfell: Vär dĕn fĕl (not so much a Dunmeri word as a Dwemer one)