| 8 Altaic | 8.3 Proto-Altaic to Proto-Mongolic | a e i o u æ ø y → {a,i} {e,ja} {e,i} {ø,y,o} {o,u,y} {i,a,e} {e,ø} {ø,y,o,u} / _Ce
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| a e u æ ø y → {a,e} {e,i} {y,ø} {i,e} {i,e,ø} {ø,y,o,u} / _Ci
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| e → {y,ø} / P_Co
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| e → {y,ø} / C_Po
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| a e o i æ ø y → {a,i,e} {a,e} u {o,u} e {ø,y,o,u} {o,u} / _Co
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| a e {o,u} æ ø y → {a,o,u} {e,a} {o,u} {a,o,u} {e,i,u} {i,o,u,y,ø} / _Cu
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| 8.5 Proto-Altaic to Proto-Turkic | a {e,i} o u æ ø y → {ɛ,a} ɛ {ø,o} {y,u} {ia,ja,ɛ} {ia,ja} {y,ø} / _Ci
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| 8.5.1 Proto-Turkic to Proto-Kypchak | ew (→ øj) → yj
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| 8.5.1.2 Proto-Kypchak to Kyrgyz | {u,ɯ}w {i,y}w aw {æ,e}w → uː yː oː øː
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| 8.5.2 Proto-Turkic to Sakha | o oɡ ø øɡ iɡ → wo ɥø oː øː iː
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| 10 Austronesian | 10.3.3 Proto-Oceanic to Lemerig | — oCV[+ high] → øC
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| 17 Indo-European | 17.7.2.1.9 Early Northern Middle English to Scots | — iː eː ɛː aː oː uː {øː,yː} → əi i {i,e} e o u ø
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| 17.7.2.1.10 Old English to Scots | oː → ø
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| 17.7.2.3 Middle High German to Standard German | e(ː) i → ø(ː) y / _C[+ affricate]
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| e(ː) i → ø(ː) y / _{P,l,ʃ} (sporadic?)
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| e(ː) i → ø(ː) y / {P,l,ʃ}_ (sporadic?)
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| uː yː iː → ou øy ei, except in certain unstressed endings and monosyllables, _C{C,V,#} (“especially before /xt/”), and Low German borrowings
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| u y → o ø / _N (with some occasional exceptions)
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| 17.7.2.4 High German Cosonant Shift and Umlaut | a u o → e y ø / _(C…){i(ː),j}
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| 17.7.3.1 Proto-Norse to Old Norse | a(i) {e,w{æ,i}} {we,ei} (w)ɪ → ey ø y ʏ / w_ ! hw_
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| u {o,ɒ} a au juː → y ø æ y yː / _(C)(C)(C)j
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| a(ː) ae → o(ː) ɒø / #(C)(C)(C)_(C)(C)(C)u
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| {(j)u,we}ː {o,ɒ}ː aː au → yː øː æː æy
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| u {o,ɒ} a → y ø æ / _(C)(C)(C)i
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| u {o,ɒ} a au juː → y ø æ æy yː / _(C)(C)(C)i
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| {u,we,wi} {o,ɒ} a au juː → y ø æ æy yː / _(C)(C)(C)i
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| wa we wi → ɒː øː yː / #P_
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| au {ai,ey,ei} æ{y,i} øy Vː → o e æ ø V / #(C)(C)(C)_CC
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| u {o,ɒ} a au juː → y ø æ æy yː / _(C)(C)(C)j
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| u {o,ɒ} a au juː → y ø æ æy yː / #(C)(C)_ʀ
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| ʏ ɪ → ø e
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| woː wøː jæː Vː → wo wøje V[- long] / _%
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| uN yN iN VN → o øː eː Vː / _{s,f}
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| 17.7.3.1.1 Old Norse to Early Icelandic | ɒ ɒː → ø aː
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| u o a ø y e i → uː oː aː øi yː ei iː / _{ɲc,ɲɟ,ŋk,ŋɡ}
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| u o a øː eː y i → ʏɪ oi ai øi ei yː iː / _j
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| 17.7.3.1.2 Old Norse to Orkney Norn | u → ø / _l(ː)
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| uː → øː / _CC
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| o a → ø ɛ / _(C)(C)i
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| o → ø / _Cr
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| oː → øː / _(C)(C)#
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| joː → {u,o,ø} (looks like being in the ultima or the penult may have had something to do with it, but it isn’t clear to me)
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| a aː → ɛ øː / _r
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| œ → ø / _l
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| yː → ø / _j
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| 17.7.3.1.3 Old Norse to Shetland Norn | uː → {u,o,ɒ,ø} (conditioning unclear; it seems the presence of a velar consonant may have helped to retain the quality of /u/)
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| ɒ → ø / _O[+ dental/alveolar]
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| {ɒ,ey} j{u,o,a}ː yː → o ø u / Ḱ_
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| j{u,o,a}ː → ø
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| yː → ø / _O[+ dental/alveolar]
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| ey → ø
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| 17.8.2 Proto-Indo-European to Attic Greek | oj → øj → yj (→ yː sometimes)
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| 17.8.3 Proto-Indo-European to Boeotian Greek | {eː,ej} ɛː ɑ(ː)j {oj,ɔːj} → iː eː ɛː {y,ø}
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| 17.8.8 Proto-Indo-European to Ionic Greek | oj → øj → yj (→ yː sometimes)
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| 29 Na-Dene | 29.1.1.1.39 Proto-Athabaskan to Upper Tanana | ə → {a,ɨ} (→ ø in the Northway dialect)
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| 42 Uralic | 42.1.1 Pre-Finnic to Proto-Finnic | ixi uxu → øː oː
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| UŋA eŋi → Oː øː
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| Uwi ewi → oː øː
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| yje → øː → jø (?)
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| 42.1.1.1.1 Proto-Finnish to Standard Finnish | eː øː oː → ie yø uo
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| e → ø / #(C…)_y
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| 42.1.2 Proto-Finnic to Livonian | eː øː oː ɤ(ː) → iːe yːø uːo ɨ(ː)
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| 43 Uto-Aztecan | 43.2 Proto-Uto-Aztecan to Hopi | o → ø
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| 46 Vowel Shifts | 46.5 Old English-to-Scots Vowel Shifts | iː eː ɛː aː oː uː {øː,yː} → əi i {i,e} e o u ø
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| 46.10 Late Proto-Finnic to Savonian Vowel Shift | eː øː oː → ie yø uo
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| ei oi øi → eː oe øe
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| æy øy → æː øː
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| 46.13 Old Norse to Faroese Vowel Shift | {œ,ɔ} → øː/œ “(except Suðuroy → ʏ)”
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