There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.

Qenya 

nan-

prefix. backwards

nan-

verb. to go back, to go back, [ᴺQ.] *retreat, give way, revert, ebb, (lit.) move backwards

nan

adverb/conjunction. but, on the contrary, on the other hand; again

Qenya [Ety/NDAN; LR/072; PE22/124; PE23/109] Group: Eldamo. Published by

-n(an)

suffix. time

Qenya [PE23/109; PE23/110] Group: Eldamo. Published by

tasarinan

place name. Land of Willows

Qenya [TI/417; TII/Tasarinan] Group: Eldamo. Published by

en kárielto eldain isil, hildin úr-anar; toi írimar

for Elves they made the Moon, but for Men the red Sun; which are beautiful

nan úye sére indo-ninya símen, ullume

but my heart resteth not here for ever

tasse intin nan

there they (are) again

Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.