The Black Speech was a language devised by Sauron during the Dark Years to be the sole language of the servants of Mordor, replacing the many different varieties of Orcish and other languages. It may have been a standardised form of regional Orcish tongues combined with elements of Valarin, the Eldest Speech. see:
Black Speech and Mordorian Orcish seem to have lacked the letters c, ch, e, j, s. In BS c turns to k, ch to kh, j to y and s to sh or zh. It is unknown if e was omitted or replaced by a different syllable, it is also not entirely clear if the letters f, q, v and x existed in BS as only Fh is attested and q seems to have been substituted by ku, v by w or fh and x by ks, though it is not known is this was true for all mordorean and derived dialects.
Black Speech´s main source, Melkian seems to have still known the letters s, v and x.
- ↑ J.R.R. Tolkien, The Lord of the Rings, Appendix F, "On Translation"