Orc

An orc (or ork) is a fictional humanoid monster akin to a goblin. Orcs were brought into modern usage by the fantasy writings of J. R. R. Tolkien, especially The Lord of the Rings. 
Mythological monsters with names similar to "orc" can be found in the Old English poem Beowulf, in Early Modern poetry, and in Northern European folk tales and fairy tales. Tolkien stated that he took the name from Beowulf.Carpenter 1981, #144 to Naomi Mitchison 25 April 1954. Via Wikipedia.
etym
/ɔːrk/ 
== r ==
Orcish; Orc-like; Orcling; The orcs; Monsters; Fictional monster (as opposed to traditional myth?)
Gremlin