In Tolkien's Sindarin language, Orc is orch, plural yrch. In his late, post-Lord of the Rings writings (published in The Peoples of Middle-earth), he preferred the spelling "Ork", evidently mainly to avoid the form Orcish, which would be naturally pronounced with the c as /s/ instead of /k/. (In Tolkien's languages the letter c was always pronounced /k/.) It is also possible that the word is a Common Tongue Version of 'orch', the Sindarin word for Orc. The original sense of the word seems to be "bogey", "bogeyman", that is, something that provokes fear, as seen in the Quenya cognate urko, pl. urqui. In the old English Orc means "demon." The term Uruk-hai merely means "orc-folk" in the Black Speech, and was the Uruk-hai's name for themselves.
