This lecture shows which German nouns take an 'e' ending or an umlaut plus an 'e' ending in the plural. It is part of my online course 'German gender #2 - the plurals of German nouns' and it will help you learn how to make sense of the German plural endings jungle.
For more info check here https://angelikasgerman.uteach.io/courses/german-grammar-gender-2
2. The ‘e’ ending is taken by many single-syllable nouns (not by
all unfortunately). Also to nouns ending in –eur, -ich, -ier, -ig, -
ling, –är and -ör.
Examples:
Das Bein – Beine
Der Jongleur – Jongleure
Der Teppich – Teppiche
Das Papier – Papiere
Der König – Könige
Der Schmetterling - Schmetterlinge
Der Pensionär - Pensionäre
5. Some single-syllable nouns also take an umlaut as
well as the ‘e’ in the plural:
Examples:
Der Arzt = Ärzte
Der Bart – Bärte
Der Kuss – Küsse
Der Sohn – Söhne
These rules also apply to compound nouns. Arzt =
Ärzte, Zahnarzt = Zahnärzte