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 

oia

adverb/adjective. everlasting

Qenya [Ety/OY; EtyAC/OY] Group: Eldamo. Published by

ia

adverb. ever

Qenya [Ety/EY; Ety/GEY] Group: Eldamo. Published by

oi

adverb. ever

oi-

verb. to live, pass one’s days

indon

conjunction. as

The correlative ᴹQ. indon “as” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/111), a combination of the relative pronoun ᴹQ. i and the similative suffix ᴹQ. -ndon.