The Necklace of the Dwarves holding a Silmaril (S/114), a combination of [N.] naugol “Dwarf” and mîr “jewel” (SA/mîr), the middle a perhaps being the archaic genitive suffix -a.
Conceptual Development: In the earliest Lost Tales, this name was G. Nauglafring (LT2/221), a form that was retained in the early Silmarillion drafts (SM/33, SM/134), but was replaced with Ilk. Nauglamír later in the 1930s (SM/313, LR/141). In The Etymologies, this name was designated Doriathrin [Ilkorin], with its initial element being the genitive of Dor. naugol “dwarf” (Ety/NAUK, MIR). This form was not updated in the Silmarillion revisions from the 1950s-60s, but no longer fit the phonology of later Sindarin (the expected form would be Nauglavir). Either it was dialectical or (more likely) Tolkien never got around to revising it.
A term for the Dwarves as a race, translated “Stunted People” (S/91) or “Stunted Folk” (WJ/388), a combination of naug “stunted” and the class-plural suffix -rim (SA/naug, rim; WJ/388).
Conceptual Development: In earliest Lost Tales, the common collective term for the Dwarves was G. Nauglath (LT1/236), replaced with N. Nauglar or Nauglir in the Silmarillion drafts from the 1930s (SM/104, 311; LR/405). Later in the 1930s, the form Naug-rim emerged (LR/273), which Tolkien generally used thereafter.