The form bronio in the Etymologies is a misreading according to VT/45:7
Noldorin
-(r)on
suffix. agental suffix
-(i)on
suffix. adjectival suffix
-on
suffix. agental suffix
-on
suffix. masculine suffix
-or
suffix. agental suffix
-we
suffix. masculine suffix
aer
noun. sea
al-
prefix. no, not
an-
prefix. with, by
ant
noun. gift
ant
noun. gift
ath-
prefix. on both sides, across
balan
noun. Vala, divine power, divinity
barad
noun. tower, fortress
brannon
noun. lord
brannon
noun. lord
brassen
adjective. white-hot
brenia-
verb. to endure
caer
noun. flat isle on a river
ceir
noun. ship
ceir
noun. ship
cîr
noun. ship
côl
noun. gold (metal)
dôl
noun. head
dôl
noun. hill or mountain
edonna-
verb. to beget
ephel
noun. outer fence, encircling fence
eria-
verb. to rise
A verb in The Etymologies of the 1930s glossed “rise”, appearing as {oria >>} erio [Noldorin-style infinitive forms], derived from ON. {orta- >>} ortie or orie “rise” [Old Noldorin infinitives] under the root ᴹ√ORO “up, rise, high” (Ety/ORO; EtyAC/ORO). The change of e to i from ON. oria- to N. eria- was due to i-affection. This verb had an archaic [ON?] past †oronte “arose” [likely based on ON. orta-], and modern past form of {orias >>} erias, though this modern past was hard to make out in the source document. The suffix -as is the generalized intransitive past tense suffix for Noldorin/Sindarin derived verbs, as opposed to transitive past -ant.
Conceptual Development: There are some words in Early Noldorin word-lists of the 1920s of similar derivation, incuding ᴱN. rhó “to arise” from primitive ᴱ✶roso- (PE13/152) and rhosta- or amrosta- from primitive ᴱ✶-rosi-, unglossed but appearing under ᴱN. amrost “rising” which served as a gerund for these verbs (PE13/159). See the entry for ᴱN./G. amra- for other early verbs meaning “rise, go up”, based instead on ᴱ√AM(U) “up”.
esgar
noun. shore
falathren
noun/adjective. of the shore
falathren
noun/adjective. Shore-language (one of the names for Common Speech)
fara-
verb. to hunt
fein
noun/adjective. white
fein
noun/adjective. cloud
gad-
verb. to catch
gala-
verb. to grow
glaer
noun. long lay, narrative poem
Written glær (with ae-ligature) in the Etymologies, rectified here according to VT/45:15
glaur
noun. gold
glawar
noun. sunlight, radiance (of the golden tree Laurelin)
gondrafn
noun. hewn stone
gondram
noun. hewn stone
gonn
noun. great stone, rock
heltha-
verb. to strip
The form helta- in the Etymologies is a misreading according to VT/46:14
ho
pronoun. he
ho
pronoun. he
hon
pronoun. he
hon(o)
pronoun. he
hono
pronoun. he
hortha-
verb. to urge on, speed
lembas
noun. waybread
lhû
noun. a time, occasion
mallen
adjective. of gold, golden
malt
noun. gold (as metal)
malthen
adjective. of gold, golden
minnas
noun. tower
minnas
noun. fort, city with a citadel and central watch-tower
minnas
noun. tower
mû
interjection. no
na
preposition. with, by (also used as a genitive sign)
na
preposition. to, towards, at
no
preposition. under
With suffixed article, see also nuin
no
preposition. under
nu
preposition. under
With suffixed article, see also nuin
nuin
preposition. under the
oear
noun. sea
oear
noun. sea
oer
noun. sea
oer
noun. sea
or
preposition. above, over
or
preposition/prefix. above, above; [G.] onto, on top, on
A preposition and prefix in The Etymologies of the 1930s glossed “above” and derived from the root ᴹ√ORO “up; rise; high” (Ety/ORO).
Conceptual Development: The Gnomish Lexicon of the 1910s had adverb G. or “on, on top” which could be used as a preposition meaning “on, onto” (GL/63), clearly also derived from ᴱ√ORO. As a prefix, G. or- meant “on, onto, up, in addition to, etc.” (GL/62).
Neo-Sindarin: For purposes of Neo-Sindarin I would only use or as an adverb/preposition/prefix for “above [not necessarily touching]”, while for “on [top of]” I would use S. po.
or-
prefix. above, over
orthel-
verb. to roof, screen above
parf
noun. book
parf
noun. book
pôd
noun. animal's foot
rhafn
noun. wing (horn), extended point at side, etc.
sarn
noun. stone (as a material)
Sern in UT/463 is a misprint, see VT/42:11
sarn
noun. small stone
Sern in UT/463 is a misprint, see VT/42:11
tamma-
verb. to knock
A verb appearing as its Noldorin-style infinitive form tammo “to knock” in The Etymologies of the 1930s, derived from primitive ᴹ✶tambā́- under the root ᴹ√TAM “knock” (Ety/TAM; EtyAC/TAM). In The Etymologies as published in The Lost Road Christopher Tolkien gave the infinitive form as tamno (LR/390), but Carl Hostetter and Patrick Wynne corrected this to tammo in their Addenda and Corrigenda to the Etymologies (VT46/17).
thora-
verb. to fence
tirion
noun. tower
tâl
noun. foot
A prefix for “on both sides, across” in The Etymologies of the 1930s based the root ᴹ√AT(AT) “again, back” having to do with the number “two” (Ety/AT(AT)).
Conceptual Development: The root ᴹ√YAT “join” had deleted preposition N. iath “across” (EtyAC/YAT). In Tolkien’s later writings, prefixal “across” was generally thar or athra- based on the root √THAR (PE17/14), while S. ath- was used for “easy” (PE17/148).