Noldorin
ninn
adjective. slender
ninn
adjective. slender
eilian
noun. rainbow
eilianw
noun. rainbow
elw
adjective. (pale) blue
lhorn
noun. quiet water
lhorn
noun. anchorage, harbour
lhûn
adjective. (unknown meaning)
This word, which also appears on the map of Middle-earth in LotR, is glossed as "blue" in The Etymologies, but Tolkien later rejected this meaning (as luin was already used in that sense). He then proposed several explanations for it, including the possible adaptation of a Dwarvish name into Sindarin, but he apparently never reached a definitive solution.
lhûn
adjective. blue
nen
noun. water (used of a lake, pool or lesser river)
nen
noun. waterland
nen
noun. water
See ianu and iant for a discussion