Sern in UT/463 is a misprint, see VT/42:11
Noldorin
-gon
suffix. valour
gonn
noun. great stone, rock
caun
noun. valour
caun
noun. valour
gondrafn
noun. hewn stone
gondram
noun. hewn stone
sarn
noun. stone (as a material)
sarn
noun. small stone
Sern in UT/463 is a misprint, see VT/42:11