A verb appearing as G. nosta- “am born” in the Gnomish Lexicon of the 1910s (GL/61), based on the early root ᴱ√NŌ “become, be born” (QL/66).
Neo-Sindarin: Sami Paldanius coined a neologism ᴺS. enia- “to be born, be generated, result” in the VQP (VQP) based the root √ONO “be born”, from primitive ✱onya-. I prefer enia- “be born” over nosta- mostly to avoid conflict with the neologism ᴺS. nosta- “to smell”, for which I have no good replacement.
A word appearing as G. {nort >>} nost in the Gnomish Lexicon of the 1910s with three distinct meanings: “birth”, “blood = high birth” and “birthday”, though the last sense also applied to the word G. {noss >>} nôs (GL/61). It is clearly based on the early root ᴱ√NŌ “become, be born” (QL/66). G. nosteg seems to be an adjectival variant in the phrase dana nosteg “birthday = ✱day of birth” (GL/61)
Neo-Sindarin: The usual Neo-Sindarin word for “birth” is ᴺS. onnad, gerund of the verb onna- “✱to give birth”; I’m not sure who coined this neologism, but it has been in use for some time.