German words in which only one vowel is different.
Words like "lieben" and "leben" have only one vowel that is different (when pronounced). Please, give me some more examples of such word pairs where only these two vowels (E and I) replace each other (If there are any)
Also if there are any such word pairs but with vowels O and U, please tell me those as well.

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loben - leben - laben
liegen - legen
Lied - Leid
rot - Rat
ging - Gong - Gang
hing - Hang
There are some surnames which are written differently, but pronounced the same: Meyer, Mayr, Maier

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Egel - Igel
ehren - ihren
Segel - Siegel
wer - wir
zehren - zieren
betten - bitten
Reet - Riet
gebt - gibt (2 different forms of the verb "geben")
legen - liegen
setzen - sitzen

Ohr - Uhr
groß - Gruß
floss - Fluss
genoss - Genuss
Loft - Luft

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Thank you! I also found words "dehnen" and "dienen"

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Denken und danken. Fu"llen und fu"hlen. Haben und heben. Sehen und sagen.   That's all I can think of now- it's been quite a while.  Sorry I can't do the umlaut.