Sern in UT/463 is a misprint, see VT/42:11
Noldorin
gond
noun. rock
gondolin
place name. Heart of Hidden Rock
gondrafn
noun. hewn stone
gondram
noun. hewn stone
gonn
noun. rock, stone (as a material)
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