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.

Gnomish

laith

adjective. *lost

An adjective for “lost” appearing in its plural form laithi in Gnomish translations of the name of The Book of Lost Tales: G. i·band a·gwentin laithi or i band cwention laithi from The Gnomish Grammar (GG/11-12). It is clearly related to the verb G. laitha- “let slip, lose” from the Gnomish Lexicon (GL/52).

Gnomish [GG/11; GG/12] Group: Eldamo. Published by

laith

noun. time, the course of time; (properly) lapse

Gnomish [GL/45; GL/52; GL/53] Group: Eldamo. Published by

laith(r)a-

verb. to let slip, lose, mislay, forget; (intr.) to be lost

A verb appearing as G. laitha- or laithra- “let slip, lose, mislay, forget” from the Gnomish Lexicon; it could also be used intransitively to mean “to be lost”, especially in the form laithra- (GL/52). Tolkien said it was the result of a mingling of two roots: ᴱ√lech and ᴱ√lith-, the former having to do with slippery things and the latter with time.

Neo-Sindarin: In 2018 I made an attempt to salvage this verb (my suggestion was ᴺS. laetha-), but this was rejected by the community. In a Discord conversation in 2022-04-16, Elaran proposed redefining this verb as lítha- “to let slip, lose, mislay; (intr.) to be lost” based on the later root √LIK “slip” which was recently published; by extension it can also mean “to forget”. I quickly adopted Elaran’s proposal as better than mine.

Gnomish [GL/52; GL/53] Group: Eldamo. Published by

gî(laith)

adverb. once, in past

A word in the Gnomish Lexicon of the 1910s appearing as G. { >>} gî(laith) “once, in past” (GL/38). Its second element is G. laith “time” (GL/52), and its first might be based on the early root ᴱ√DYĒ “behind, back (before of time)” (QL/105). Tolkien also said that it “often, in form , [was] used loosely as a mere aid to a past tense”.

u laud u laith hasta unweg

*neither flood nor time waits for anyone

aluin

masculine name. Time

Gnomish [LT1/219; LT1/222; LT1A/Lúmin; LT1I/Aluin] Group: Eldamo. Published by

lûm

noun. time

Gnomish [GL/55; LT1A/Lúmin] Group: Eldamo. Published by

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.