A word specifically for a “[metal] smith” based on primitive ✶sinkitamo, as opposed to more generic tamo “smith, ✱builder” which can refer to a variety of craftsman (PE17/107-108). Its initial element seems to be a restoration of ᴱQ. sink “mineral, metal, gem” from the 1910s (QL/83), and might be related to Q. sinca “flint”. If so, this word may have originally meant “✱mineral smith”, perhaps referring to the extraction of metal from minerals.
Conceptual Development: The Qenya Lexicon of the 1910s had ᴱQ. tongar “smith”, apparently an agental form ᴱQ. tonga “great hammer” under the early root ᴱ√TOŊO, so more literally “✱hammerer” and thus likely referring to metal smithing (QL/94).
sintamo noun "smith" (PE17:107-108), cf. more usual variant tamo, q.v.