German plural forms: five patterns, not memorisation

German has five plural patterns: -(e)n (most feminine nouns), -e ± Umlaut (most masculine and many neuter nouns), -er + Umlaut (many neuter nouns), no ending ± Umlaut (masculine and neuter nouns ending in -er/-el/-en, plus all -chen and -lein diminutives), and -s (foreign-origin words and loanwords). Knowing a noun's gender gives you a strong prediction for which pattern applies — this is a learnable system, not a noun-by-noun lottery.

Feminine nouns take -n or -en in roughly 95% of cases — making it the most predictable gender-to-plural mapping in German. Masculine nouns most commonly take -e (with or without Umlaut), but also use -er (with Umlaut), no-change (± Umlaut for -er/-el/-en endings), and occasionally -s for foreign-origin words. Neuter nouns most often take -e or -er (with Umlaut for monosyllables), no-change for -chen/-lein diminutives, and -s for foreign loans. Knowing the gender gives you a strong probabilistic starting guess.

The -er pattern almost always umlauts a, o, u in the root (Haus → Häuser, Buch → Bücher, Mann → Männer), with Kind → Kinder being an exception because there is no umlautable vowel. The no-change pattern often umlauts (Apfel → Äpfel, Bruder → Brüder, Mutter → Mütter) but not always (-chen/-lein diminutives never umlaut). The -e pattern umlauts approximately 50% of the time (Stadt → Städte yes, Tag → Tage no). The -n/-en and -s patterns never umlaut — knowing the pattern tells you whether to expect an Umlaut.

Mutter is a native German noun belonging to the no-change-plus-Umlaut class (like Bruder → Brüder, Tochter → Töchter) — the Umlaut is part of the plural pattern for native German nouns in this category. Auto is a foreign-origin borrowing (from Latin via Italian), and foreign-origin nouns almost always take -s with no Umlaut. The contrast illustrates the native-vs-borrowed split that governs the -s pattern: apply -s to loanwords and recent borrowings, not to native German nouns.

All three genders collapse to die in the nominative and accusative plural — der Mann, die Frau, and das Kind all become die Männer, die Frauen, die Kinder. In the dative plural the article becomes den, and the noun itself adds an extra -n suffix unless it already ends in -n or -s: den Männern, den Kindern, den Häusern, but den Autos (no extra -n after -s). In the genitive plural the article is der.

Yes — two shortcuts cover a large portion of everyday vocabulary. First, nouns ending in -chen or -lein are always neuter and always have no-change plurals with no Umlaut: das Mädchen → die Mädchen, das Häuschen → die Häuschen. Second, feminine nouns ending in -e, -heit, -keit, -ung, -ion, -schaft, or -tät almost always take -n or -en: die Frage → die Fragen, die Freiheit → die Freiheiten, die Zeitung → die Zeitungen. These two rules let you handle a large set of nouns confidently without looking up the plural.

Both are plurals of das Wort, but they are not interchangeable. Wörter refers to individual, unconnected words — the items in a vocabulary list or dictionary entry: "Ich lerne neue Wörter" (I am learning new vocabulary words). Worte refers to words as a meaningful utterance — a quote, a saying, or a few well-chosen remarks: "Das waren weise Worte" (Those were wise words / a wise saying). When in doubt, Wörter is the more common choice in everyday language.

No. Roughly 80% of German plural forms are predictable once you know the noun's gender and its singular ending — apply the matching pattern and add or withhold the Umlaut according to the pattern rule. The remaining 20% is a fixed set of high-frequency irregulars (Mutter, Tochter, Bruder, Mann, Kind, Haus, Buch, and about 25 others) that are worth learning as a single curated list rather than encountering them one by one in the wild. Recording each new noun as "article + singular + plural" (der Apfel, die Äpfel) from the start is the single most effective habit for mastering plurals.