Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Qenya 

lóme

noun. night, night-time, shades of night, gloom

Qenya [Ety/DOƷ; Ety/DOMO; Ety/LUM; EtyAC/LOƷ; LR/041; PE21/32; SD/302; SD/306; SD/415; SM/241] Group: Eldamo. Published by

ala

noun. day

Qenya [EtyAC/GAL¹] Group: Eldamo. Published by

are

noun. day

Qenya [Ety/AR¹; PE23/100; PE23/109] Group: Eldamo. Published by

hui

proper name. Night

A name for (Primordial?) Night appearing in The Etymologies from the 1930s as a derivative of the root ᴹ√PHUY, along with its (archaic?) variant Fui (Ety/PHUY).

Conceptual Development: This name is most likely a remnant of the name ᴱQ. Fui from the earliest Lost Tales, where it was another name for the goddess ᴱQ. Nienna (LT1/66, LT1A/Fui). According to the Qenya and Gnomish Lexicons from the 1910s, this earlier version of the name is derived from the root ᴱ√ǶUẎU (GL/36, QL/38).

núre

noun. night