There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
dol dúghol
place name. Dol Dúghol
dol Reconstructed
noun. head, *hill
An Ilkorin noun for “head” attested only as an element in the name Dolmed “Wet Head” (Ety/MIZD, NDOL). It might also appear in Dol Dúghol, assuming that name is Ilkorin. Assuming it functions similarly to its Noldorin equivalent N. dôl, it can probably also be used to refer to a hill.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
An earlier name for Dol Guldur appearing in Lord of the Rings drafts from the 1940s (WR/122), with variations Dol Dúgol (TI/178) and Dol Dûghul (TI/244). The word dûghol appears an earlier rejected word for “sorcery” in The Etymologies (EtyAC/ÑGOL), so perhaps this word was originally intended to be Ilkorin.