Doriathrin
esgalduin
place name. River under Veil
eglor
place name. Elf-river
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.
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 S. Nenning, the river flowing past the haven of Eglorest, marked Ilkorin and translated “Elf-river” in The Etymologies (Ety/ELED). It is likely an elaboration of Ilk. Egla “Elf”. Earlier still the river was named Eldor (SM/227), perhaps containing the earlier (rejected) Ilkorin word Ilk. Eld “Elf”.