ON. [ā], [au] became [ǭ]; [ā|au] > [ǭ]

ON. [ā], [au] became [ǭ]; [ā|au] > [ǭ]
GS/§4.58 GS/§4.98 @@@ probably ou > ǫu @@@ Tolkien may have abandoned au > [ǭ] since it was not mentioned on PE22/27 and there is no evidence of it in later writing

References ✧ PE18/46; PE22/15, 27, 39, 48

Order (02800)

After 00900 first in pair of voiced stops vocalized ᴹ✶khagda > N. hauð Ety/KHAG
Before 02900 final [ǝ] was lost after [l, r, n, s], otherwise it became [a] ᴹ✶galā́sŏ > galṓsǝ > ON. galṓs PE22/26
Before 03500 [oi], [ǭi] became [ui] ᴹ✶wāyā > wōia > ON. uia Ety/WAY
Before 04600 [w] vanished before [u] ᴹ✶wāyā > wōia > ON. uia Ety/WAY

Phonetic Rule Elements

[ā] > [ǭ] ✧ Ety/THŌN (ā > ō); PE19/25 (ā > ǭ)
[au] > [ǭ] ✧ PE19/25 (au > ǭ)

Phonetic Rule Examples

glaure > glǭre au > ǭ ᴹ√GLAW(-R) > N. glaur ✧ Ety/GLAW(-R)
glaure > glǭre au > ǭ ᴹ√GLÁWAR > N. glaur ✧ Ety/LÁWAR
gaule > gǭle au > ǭ ᴹ√GAWA > N. Gaul ✧ Ety/GAWA
gauta > gǭta au > ǭ ᴹ√GAWA > N. gaud ✧ Ety/GAWA
gotʰombauko > gotʰombǭko au > ǭ ᴹ✶Gothombauk- > N. Gothmog ✧ Ety/MBAW
gotʰorauko > gotʰorǭko au > ǭ ᴹ✶Gothorauk- > N. Gothrog ✧ EtyAC/MBAW
indoglaurē > indoglǭre au > ǭ ᴹ✶Indo-ʒlaurē > Indlour > N. Inglor ✧ Ety/ID
kʰāda > kʰǭda au > ǭ ᴹ✶khagda > N. hauð ✧ Ety/KHAG
kʰausta > kʰǭsta au > ǭ ᴹ✶khau̯-stā > N. haust ✧ Ety/KHAW
lauka > lǭka au > ǭ ᴹ✶lauka > N. lhaug ✧ Ety/LAW
mbauj > mbǭj au > ǭ ᴹ✶mauy- > N. bui ✧ Ety/MBAW
mbauka > mbǭka au > ǭ ᴹ√MBAW > N. baug ✧ Ety/MBAW
ŋgaule > ŋgǭle au > ǭ ᴹ√ÑGAW > N. gaul ✧ Ety/ÑGAW
ŋgauro > ŋgǭro au > ǭ ᴹ√ÑGAW > N. gaur ✧ Ety/ÑGAW
nauki > nǭki au > ǭ ᴹ√NAU̯K > N. nuig ✧ EtyAC/NAUK
naukla > nǭkla au > ǭ ᴹ√NAU̯K > N. naugol ✧ Ety/NAUK
nauko > nǭko au > ǭ ᴹ√NAU̯K > N. naug ✧ Ety/NAUK
nauta > nǭta au > ǭ ᴹ√NUT > N. naud ✧ Ety/NUT
pʰinderauto > pʰindarǭto au > ǭ ᴹ✶Phinde-rauto > N. Finrod ✧ Ety/PHIN
pʰauka > pʰǭka au > ǭ ᴹ√PHAU̯ > ON. phauka ✧ Ety/PHAU
rauko > rǭko au > ǭ ᴹ√RUK > N. rhaug ✧ Ety/RUK
rauta > rǭta au > ǭ ON. rauta > N. rhaud ✧ Ety/RAUTĀ
taura > tǭra au > ǭ ᴹ✶tau̯rā > N. taur ✧ Ety/TĀ
taure > tǭre au > ǭ ᴹ✶tau̯rē > N. taur ✧ Ety/TÁWAR
tʰaurena > tʰǭrena au > ǭ ᴹ✶tháurēnā > N. thoren ✧ Ety/THUR
tʰausa > tʰǭsa au > ǭ ᴹ✶thausā > N. thaw ✧ Ety/THUS
abāro > abǭro ā > ǭ ᴹ✶ábārō̆ > ON. abōro ✧ Ety/AB
anār > anǭr ā > ǭ ᴹ✶anār- > N. Anor ✧ Ety/ANÁR
anār > anǭr ā > ǭ ᴹ✶Anār > Anaur > N. Anor ✧ SD/303
anār > anǭr ā > ǭ ᴹ✶Anār > Anaur > N. Anor ✧ SD/306
atlāta > atlǭta ā > ǭ ᴹ√TALÁT > atlaud > N. aclod ✧ Ety/TALÁT
bāda > bǭda ā > ǭ ᴹ✶bād- > N. bauð ✧ Ety/BAD
brekāla > brekǭla ā > ǭ ᴹ✶berékā > N. bregol ✧ Ety/BERÉK
brekāla > brekǭla ā > ǭ ᴹ√MERÉK > N. bregol ✧ Ety/MERÉK
dauda > dǭda ā > ǭ ᴹ✶dagdā > N. dauð ✧ EtyAC/DAG
dāra > dǭra ā > ǭ ᴹ✶daʒrā > N. daur ✧ EtyAC/DAƷ
drāka > drǭka ā > ǭ ᴹ✶d’rāk > N. draug ✧ Ety/DARÁK
galāsǝ > galōsǝ ā > ǭ ᴹ✶galā́sŏ > galṓsǝ > ON. galṓs ✧ PE22/26
glā > glǭ ā > ǭ ᴹ✶g’lā́ > N. glaw ✧ Ety/KAL
gāsa > gǭsa ā > ǭ ᴹ✶gāsa > N. gaw ✧ Ety/GAS
istāja > istǭja ā > ǭ ᴹ✶istāyā > N. istui ✧ Ety/IS
jā > jǭ ā > ǭ ᴹ√YA > N. io ✧ Ety/YA
jābasūka > jǭbasūka ā > ǭ ᴹ✶yābā̆-sūka > ON. yōbasūka ✧ TMME/53
jābe > jǭbe ā > ǭ ᴹ√YAB > N. iau ✧ Ety/YAB
jābi > jǭbi ā > ǭ ᴹ√YAB > N. iui ✧ EtyAC/YAB
jāna > jǭna ā > ǭ ᴹ√YAN > N. iaun ✧ Ety/YAN
jāra > jǭra ā > ǭ ᴹ√YA > N. iaur ✧ Ety/YA
katwāra > katwǭra ā > ǭ ᴹ✶katwārā > N. cadwor ✧ Ety/KAT
kemenāro > kemenǭro ā > ǭ ᴹ√KEM > N. cevnor ✧ EtyAC/KEM
klāra > klǭra ā > ǭ ᴹ√KAL > N. †claur ✧ Ety/KAL
kāne > kǭne ā > ǭ ᴹ√KAN > N. caun ✧ Ety/KAN
kāsa > kǭsa ā > ǭ ᴹ√KAS > N. caw ✧ Ety/KAS
mbāla > mbǭla ā > ǭ ᴹ√ÑGWAL > N. baul ✧ Ety/ÑGWAL
mā > mǭ ā > ǭ ᴹ✶māʒ > ON. mō ✧ Ety/MAƷ
māga > mǭga ā > ǭ ᴹ✶māgā > N. maw ✧ Ety/SMAG
māga > mǭga ā > ǭ ᴹ✶māga > N. maw ✧ EtyAC/MAG²
narāka > narǭka ā > ǭ ᴹ✶narāka > N. Narog ✧ Ety/NÁRAK
ndanitʰāro > ndanitʰǭro ā > ǭ ᴹ✶ndani-thārō > N. Dainthor ✧ LR/188
ndāko > ndǭko ā > ǭ ᴹ✶ndākō > ON. ndōko ✧ Ety/NDAK
nāj > nǭj ā > ǭ ᴹ✶nāyǝ > noi > ON. nui ✧ Ety/NAY
nār > nǭr ā > ǭ ᴹ√NAR¹ > N. naur ✧ Ety/NAR¹
āra > ǭra ā > ǭ ᴹ√AR¹ > N. aur ✧ Ety/AR¹
persās > persǭs ā > ǭ ᴹ√PER/PERES > ON. persṓs ✧ Ety/PERES
pāme > pǭme ā > ǭ ᴹ√KWAM > N. paw ✧ Ety/KWAM
pāre > pǭre ā > ǭ ᴹ√KWAR > ON. pōre ✧ Ety/KWAR
pʰajanār > pʰajanǭr ā > ǭ ᴹ✶Phay-anāro > ON. Phayanṓr ✧ Ety/PHAY
pʰindekāno > pʰindekǭno ā > ǭ ᴹ✶Findekāno > N. Fingon ✧ Ety/PHIN
rā > rǭ ā > ǭ ᴹ✶rāu̯ > ON. rō ✧ Ety/RAW
rāba > rǭba ā > ǭ ᴹ√RAB² > N. rhaw ✧ Ety/RAMBĀ
rāba > rǭba ā > ǭ ᴹ✶rāba > N. rhaw ✧ Ety/RAB
rābana > rǭbana ā > ǭ ᴹ√RAB > N. rhofan ✧ EtyAC/RAB
rāmale > rǭmale ā > ǭ ᴹ✶rāmalē > N. rhofal ✧ Ety/RAM
rāmali > rǭmali ā > ǭ ᴹ✶rāmalē > N. rhofel ✧ Ety/RAM
rānen > rǭnen ā > ǭ ᴹ√RAN > N. rhaun ✧ Ety/RAN
smāga > smǭga ā > ǭ ᴹ√SMAG > N. hmaw ✧ Ety/SMAG
sāba > sǭba ā > ǭ ᴹ√SAB > ON. sōba ✧ Ety/SAB
spāna > spǭna ā > ǭ ᴹ✶spāna > N. faun ✧ Ety/SPAN
spāra > spǭra ā > ǭ ᴹ√SPAR² > N. faur ✧ EtyAC/SPAR²
tlāta > tlǭta ā > ǭ ᴹ√TALÁT > tlaud > N. claud ✧ EtyAC/TALÁT
tā > tǭ ā > ǭ ᴹ√TA > ON. tō ✧ Ety/TA
tā > tǭ ā > ǭ ᴹ✶tad > tā > N. tō ✧ PE19/52
tā > tǭ ā > ǭ ᴹ✶tā̆d > ON. tō ✧ PE21/58
tāra > tǭra ā > ǭ ᴹ✶tārā > ON. tōra ✧ Ety/TĀ
tāro > tǭro ā > ǭ ᴹ✶tārō > N. †taur ✧ Ety/TĀ
wāja > wǭja ā > ǭ ᴹ✶wāyā > wōia > ON. uia ✧ Ety/WAY
wājar > wǭjar ā > ǭ ᴹ✶wā́yārō̆/Vā́yārō̆ > N. Uiar ✧ Ety/WAY
wān > wǭn ā > ǭ ᴹ✶WĀ-N > N. gwaun ✧ Ety/WA-N
wāni > wǭni ā > ǭ ᴹ✶WĀ-N > N. guin ✧ Ety/WA-N
wāra > wǭra ā > ǭ ᴹ✶waʒrā > ON. wóra ✧ Ety/WAƷ

G. [ā] became [ō]; [ā] > [ō]

HPG/§1.1

Order (01300)

Before 04900 [ll] became [l] lengthening preceding stressed vowel ᴱ✶nalda > nalla > G. nâla GL/59

Phonetic Rule Elements

[ā] > [ō] ✧ GG/14 (ā > ō)

Phonetic Rule Examples

eðusmāni > eðusmōni ā > ō ᴱ✶eđusmānī > G. Edhofon ✧ GL/31
gʷāloθ > gʷōloθ ā > ō ᴱ✶ŋgua-aloþ- > gwōloth > G. goloth ✧ GL/41
gʷār > gʷōr ā > ō ᴱ✶ŋguār > gwōr- > G. gôr ✧ GL/41
jāt > jōt ā > ō ᴱ√yat- > G. gôd ✧ GL/36
jātrā > jōtrā ā > ō ᴱ√yat- > G. godra ✧ GL/36
kāla > kōla ā > ō ᴱ√cala > G. côl ✧ GL/25
kʷāmē > kʷōmē ā > ō ᴱ✶qāmē > G. côma ✧ GL/26
mbāsḷ > mbōsḷ ā > ō ᴱ✶mᵇāsḷ > G. bothli ✧ GL/23
tāði > tōði ā > ō ᴱ√tadh- > G. tôdhi ✧ GL/71