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 

núta-

verb. to set, sink (of Sun or Moon)

Qenya [Ety/NDŪ; PE22/125] Group: Eldamo. Published by

proper name. Moon

A name for the moon in linguistic notes from 1930s (PE21/38, 41), perhaps a derivative of the root ᴹ√NDŪ “go down”, though this root usually applied to the Sun. Its dual form Nunt referred to both the sun and moon (PE21/38).

Qenya [PE21/38; PE21/41] Group: Eldamo. Published by