Sern in UT/463 is a misprint, see VT/42:11
Noldorin
gondram
noun. hewn stone
gondram
noun. hewn stone
gondrafn
noun. hewn stone
gondrafn
noun. hewn stone
gonn
noun. great stone, rock
sarn
noun. stone (as a material)
sarn
noun. small stone
Sern in UT/463 is a misprint, see VT/42:11
A noun in The Etymologies of the 1930s glossed “hewn stone”, a combination of N. gonn “stone” and N. drafn “hewn log”, with (older?) variant {gondrav(o)n >>} gondravn (Ety/DARÁM; EtyAC/DARÁM).