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Words
"Ag" = us
"Ak' " = our
"Agth" = shall
"Agthu" = this world (possibly the Faceless name for Azeroth)
"An' " = in/into
"Eqnizz" = drive/motivate
"Ez" = O
"Fhn" = cycle
"Fssh" = glory
"Gag" = shall (synonym to "agth")
"Gul'kath" = gaze/look
"Guulphg" = sustain
"H'iwn" = all
"Hoq" = me
"Huqth" = sate
"Iggksh" = oppose
"Iilth" = you (the one word can mean both singular and plural, as in English)
"Kaaxth" = one thousand
"Kyth" = see
"Lwhuk" = devour
"Ma" = is/are
"Magg" = suffering
"Mh" = only
"Naggwa" = unending
"Naus" = hunger
"Nuul" = dwell
"Nuq" = adorn
"N'zoth" = seeker
"On" = it
"Oou" = die
"Phquathi" = destroyer
"Plahf" = know
"Puul" = drink
"Qam" = return
"Qor" = endless
"Qov" = heart
"Shel" = void
"Shg' " = beyond/outside
"Shgn" = fear
"Shn' " = within/inside
"Shuul" = death
"Sk' " = your
"Ssaggh" = live
"Tek" = skull
"Thoq" = for
"Thyzak" = reclaim
"Uhnish" = endless (synonym to "qor")
"Uothk" = drown
"Uq" = power
"Uull" = darkness
"Uuyat" = agony
"Vorzz" = sing
"Vwahuhn" = reckoning
"Vwyq" = again/once more
"Wah" = wing
"Woth'gl" = servant
"Xig" = how (the manner in which something happens)
"Yahf" = soul
"Yawifk" = strengthen
"Yeh'glu" = blood
"Yu'gaz" = faithful
"Ywaq" = they
"Zaix" = praise
"Zuq" = life
"Zzof" = victory
Conjunctions
"Maq" = Conjunction meaning "do not" (Equal to English "Don't")
"On'ma" = Conjunction meaning "It is" (Equal to English "It's")
"Shg'fhn" = Conjunction meaning "Outside the cycle"
"Qi' " = A prefix used to indcate the future tense; "qi'ma" = will be, for example. This is similar to the suffixes -á, -é, -án, and -ás in Spanish.
Notes
It is quite possible that the language is not original to the faceless ones, but rather the Old Gods, or just Yogg-Saron himself, as during the encounter in Ulduar, he roars two lines which follow the same language pattern.
Trivia
The language bears a resemblance to, and is no doubt inspired by, R'lyehian - the language of the Great Old Ones in H. P. Lovecraft's "The Call of Cthulhu".