A noun for “nightingale” in The Etymologies of the 1930s, adapted from Ilkorin myrilind “since mori did not = ‘night’ in N” (Ety/TIN). S. dúlin “nightingale” is better attested.
Noldorin
tinnu
noun. (starry) twilight, dusk, early night (without moon)
tinnu
noun. dusk, twilight, early night (without Moon)
tinnu
noun. starry twilight
tindu
noun. dusk, twilight, early night (without Moon)
tindu
noun. starry twilight
Tinnúviel
noun. nightingale
duilin
noun. nightingale
dúlin
noun. nightingale
dúlin(n)
noun. nightingale
dúlind
noun. nightingale
dúlinn
noun. nightingale
gwîn
noun. evening
merilin
noun. nightingale
merilin(n)
noun. nightingale
mœrilind
noun. nightingale
thîn
noun. evening
thîn
noun. evening
tinúviel
feminine name. Nightingale, (lit.) Daughter of Twilight
uial
noun. twilight
uial
noun. twilight
nightingale