A noun for “night” derived from primitive ᴹ✶mǭri (EtyAC/MOR), where the primitive [[ilk|[ǭ] became [ō]]].
Doriathrin
lómen
adjective. echoing
môr
noun. night
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
lóme
noun. night, night-time, shades of night, gloom
ando lómen
proper name. Door of Night
lámina
adjective. echoing
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
Gnomish
cwelm
noun. dusk
fui
noun. night
math
noun. dusk
tarn
noun. gate
tarn fui
proper name. Door of Night
Early Noldorin
fuin
noun. night
tarn
noun. gate
Early Primitive Elvish
maþa
root. dusk
This root was given as ᴱ√MASA¹ “dusk” in its main entry in the Qenya Lexicon of the 1910s, but its Gnomish form math- indicates the true root was ᴱ√MAÞA (QL/59). This was clarified in a list of roots at the end of the M-section in the Qenya Lexicon (QL/63) and its representation as maþ- in the contemporaneous Gnomish Lexicon (GL/59). Its most notable use in the legendarium was in the name G. Umboth-muilin “Pools (muil-plural) of Twilight (umboth)”, where G. umboth or umbath “nightfall” was derived from a strengthened form of the root, ᴱ√mbaþ- (GL/75). However, in later writings this name was reconceived as Ilk. Umboth Muilin “Veiled (muilin) Pool (umboth)”, with the first element umboth meaning “large pool” (Ety/MBOTH, MUY). The name was ultimately replaced with S. Aelin-uial (S/114), by which point the early root ᴱ√MAÞA was long abandoned.
Early Quenya
fui
noun. night
histe
noun/adjective. dusk
maske
noun. dusk
moritarnon
proper name. Door of Night
móri
noun. night
pondo
noun. gate
Middle Primitive Elvish
adnō
noun. gate
doʒ
root. night
A root in The Etymologies of the 1930s glossed “night” that (along with ᴹ√DOM) was the basis for the ᴹQ. lóme/N. dû “night” (Ety/DOƷ). It replaced some rejected variants ᴹ√LOƷ and ᴹ√DAW (EtyAC/LOƷ). Many of the derivatives of ᴹ√DOƷ were later assigned to other roots: N. dûr “dark” became S. dûr “dark” < √NDU “under, down” in notes from the late 1950s or early 1960s (PE17/152) and ᴹQ. lóna “dark” became Q. lúna (PE17/22). There are no signs of ᴹQ. ló “night” and N. daw “night-time, gloom” in Tolkien’s later writing. Future derivations of Q. lómë/S. dû only mention the root √DOM (PE17/152; PE22/153) and thus ᴹ√DOƷ may have been abandoned.
In a message to the Elfling mailing list from July 2012 (Elfling/362.96), David Salo suggested there might be a later root ✱√DU serving as the basis for Q. lúna “dark” and Q. lúmë “darkness”, though the latter might instead be from √LUM. Such a root ✱√DU is not attested in Tolkien’s writings, but if it existed, it could be a later iteration of ᴹ√DOƷ. Another possible example of the root ✱√DU is primitive ✶durnŭ “dark of hue”.
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.
Quenya
lómë
dusk, twilight
lómë noun "dusk, twilight", also "night"; according to SD:415, the stem is lómi- (contrast the "Qenya" genitive lómen rather than **lómin in VT45:28). According to PE17:152, lómë refers to night "when viewed favourably, as a rule, but it became the general rule" (cf. SD:414-415 regarding lōmi as an Adûnaic loan-word based on lómë, meaning "fair night, a night of stars" with "no connotations of gloom or fear"). In the battle-cry auta i lómë "the night is passing" (Silm. ch. 20), the "night" would however seem to refer metaphorically to the reign of Morgoth. As for the gloss, cf. Lómion masc. name "Child of Twilight [dusk]", the Quenya name Aredhel secretly gave to Maeglin _(SA). Otherwise lómë is usually defined as "night" (Letters:308, LR:41, SD:302 cf.414-15, SA:dú)_; the _Etymologies defines lómë as "Night [as phenomenon], night-time, shades of night, Dark" (DO3/DŌ, LUM, DOMO, VT45:28), or "night-light" (VT45:28, reading of _lómë uncertain). In early "Qenya" the gloss was "dusk, gloom, darkness" (LT1:255). Cf. lómelindëpl. lómelindi "nightingale" _(SA:dú, LR:41; SD:302, MR:172, DO3/DŌ, LIN2, TIN). _Derived adjective #lómëa "gloomy" in Lómëanor "Gloomyland"; see Taurelilómëa-tumbalemorna...
ando
gate
ando (1) noun "gate", also name of tengwa #5 (AD, Appendix E). A deleted entry in the Etymologies gave Ando Lómen, evidently "Door of Night" (VT45:28; notice "Qenya" genitive in -n rather than -o as in LotR-style Quenya)
histë
dusk
histë noun "dusk" (LT1:255)
hísë
dusk
hísë (2) noun "dusk" (LT1:255). A "Qenya" form possibly obsoleted by #1 above.
lámina
echoing
lámina adj. "echoing" (LAM)
usque
noun. dusk
dusk
usque
noun. dusk, twilight
North Sindarin
lómin
adjective. echoing
dor-lómin
place name. *Echoing-land
Noldorin
dor-lómen
place name. Dor-lómen
glamren
adjective. echoing
glamren
adjective. echoing
tindu
noun. dusk, twilight, early night (without Moon)
tindu
noun. starry twilight
tinnu
noun. dusk, twilight, early night (without Moon)
tinnu
noun. starry twilight
Sindarin
loven
adjective. echoing
loven
echoing
pl. lovin (only attested in North Sindarin form lómin)
Dor Lómin (Lómen)
noun. echoing land
(n-)dôr (“land, dwelling-place”), lómin ([also lómen] Dor. “echoing”)
moth
noun. dusk
and
gate
!and (door), pl. aind, coll. pl. annath. Note that and is more commonly the adj. "long".
and
gate
(door), pl. aind, coll. pl. annath. Note that and is more commonly the adj. "long".
annon
great gate
(door), pl. *ennyn***
daw
nighttime
(i dhaw) (gloom), pl. doe (i noe), coll. pl. ?dawath or ?doath.
dúath
nightshade
(i dhúath) (dark shadow), pl. dúaith (i núaith).
dû
dusk
(i dhû) (night, nightfall, late evening, darkness), pl. dui (i nui) (SD:302).
dû
night
(i dhû) (nightfall, dusk, late evening, darkness), pl. dui (i nui) (SD:302)
fuin
night, nightshade, dead of night
(gloom, darkness). No distinct pl. form.
glamren
echoing
(adj.) 1) glamren (lenited lamren; pl. glemrin), 2) *loven, pl. lovin (only attested in North Sindarin form lómin)
glamren
echoing
(lenited ’lamren; pl. glemrin)
morn
night
(i vorn) (darkness), pl. myrn (i myrn). Note: the word is also used as an adjective ”dark, black” (Letters:386).
moth
dusk
- moth (i voth), pl. myth (i myth). David Salo would read *môth with a long vowel. 2) dû (i dhû) (night, nightfall, late evening, darkness), pl. dui (i nui) (SD:302).
moth
dusk
(i voth), pl. myth (i myth). David Salo would read ✱môth with a long vowel.
tinnu
dusk
tinnu (i dinnu, o thinnu) (twilight, starlit evening, early night without a moon, starry twilight), pl. tinny (i thynny) if there is a pl.
tinnu
dusk
(i dinnu, o thinnu) (twilight, starlit evening, early night without a moon, starry twilight), pl. tinny (i thynny) if there is a pl.
tinnu
early night without a moon
(i dinnu, o thinnu) (dusk, twilight), pl. tinny (i thynny) if there is a pl.
Primitive elvish
us(u)kwē
noun. dusk
Ancient telerin
uso
noun. dusk
A Doriathrin adjective for “echoing”, a combination of lóm “echo” and the adjective suffix -en (Ety/LAM). Its Quenya cognate lámina suggests a primitive form ✱✶lāminā, from which the [[ilk|long [ā] became [ō]]] and the -en developed due to Ilkorin a-affection, as suggested by Helge Fauskanger (AL-Doriathrin/lómen).
Conceptual Development: Tolkien first wrote lómin (EtyAC/LAM), perhaps indicating some uncertainty on the exact functioning of Ilkorin a-affection on Tolkien’s part. In the North Sindarin dialect that was in some ways the conceptual successor to Ilkorin, [[norths|final [a] did not mutate preceding vowels]].