Komposita — Lego words, read right-to-left
German loves to glue nouns together into one long word. Haus + Tür = Haustür (front door). Sonne + Brille = Sonnenbrille (sunglasses). Apfel + Saft = Apfelsaft (apple juice). The result is always one word, always capitalized once at the front, and the gender is always taken from the last element (the Grundwort, 'base word'). Everything before it is the Bestimmungswort ('modifier'), telling you which kind. So: das Auto + die Bahn → die Autobahn (feminine from Bahn). die Schule + der Hof → der Schulhof (masculine from Hof). To parse a long word, read right-to-left: the rightmost noun is the head; everything left of it modifies it. Donaudampfschifffahrtsgesellschaftskapitän = a Kapitän (captain) of a Gesellschaft (company) for Schifffahrt (shipping) by Dampf (steam) on the Donau (Danube). The pieces are often joined by linking elements (Fugenelemente): -s- (Liebe-s-brief, Geburt-s-tag, Universität-s-bibliothek) — typical after feminine nouns ending in -ung, -heit, -keit, -schaft, -tät, -ion, and after most masculines/neuters; -n- or -en- (Sonne-n-blume, Strauße-n-ei, Frau-en-arzt) — typical after weak feminines and weak masculines. There are no perfect rules; each compound is lexicalized. Compounds let German build precise vocabulary on the fly: Schadenfreude, Fernweh, Kummerspeck are just nouns + nouns. Stress falls on the first element: HÁUS-tür, ÁPFEL-saft, KÚMMER-speck.
The right-most word rules everything
In any German compound, the last noun (the Grundwort) determines: (1) the gender of the whole word, (2) the plural of the whole word, (3) the basic meaning (which thing is it really?). Everything to the left modifies it. das Auto + die Bahn = die Autobahn (the highway — a kind of Bahn). die Bahn + der Hof = der Bahnhof (the train station — a kind of Hof). der Hof + der Hund = der Hofhund (the yard dog — a kind of Hund). Adjectives, verbs, or other parts of speech can be the modifier too: schnell + der Zug = der Schnellzug (fast train); schreiben + der Tisch = der Schreibtisch (writing desk); fahren + das Rad = das Fahrrad (bicycle). The Grundwort stays a noun; the modifier loses any inflection (no article on Auto- in Autobahn).
Linking elements — Fugen-s and Fugen-n
Many compounds are joined by a small linking morpheme called a Fugenelement ('joint element'). The two big ones: -s- and -n- (sometimes -en-, -er-, -e-). The -s- is overwhelmingly common: der Liebe-s-brief (love letter), der Geburt-s-tag (birthday), die Universität-s-bibliothek (university library), die Arbeit-s-zeit (working hours), der Held-en-tat — das Geschicht-s-buch (history book), das Verkehr-s-zeichen (traffic sign). It's typical when the modifier is feminine ending in -ung, -heit, -keit, -schaft, -tät, -ion, -ut (die Bedeutung → Bedeutung-s-wandel, die Freiheit → Freiheit-s-statue), and after many masculines/neuters too. The -n- / -en- appears with weak feminines like Sonne, Blume, Frau, Stunde: die Sonne-n-blume (sunflower), die Blume-n-vase (flower vase), die Frau-en-rechte (women's rights), der Stunde-n-plan (timetable). With weak masculines (der Mensch, der Junge, der Held): die Mensch-en-rechte (human rights), der Held-en-tod (heroic death). The choice is lexicalized — there's no fully predictive rule. Sometimes there's no linker at all: der Apfelbaum, der Hauswart, der Schulhof. Sometimes the modifier is shortened: die Kirche → der Kirch-turm (church tower, no e).
How to parse a Bandwurmwort (caterpillar word)
Read right-to-left. The rightmost noun is the head; everything before it specifies. Practice on die Donaudampfschifffahrtsgesellschaftskapitänsmütze: (1) the head is die Mütze (cap, feminine — so the whole monster is feminine). (2) Kapitäns-mütze = the cap of a Kapitän. (3) Gesellschafts-kapitän = a captain belonging to a Gesellschaft (company). (4) Schifffahrts-gesellschaft = a company for Schifffahrt (shipping / navigation). (5) Dampf-schifffahrt = steam-powered shipping. (6) Donau-dampfschifffahrt = steam-powered shipping on the Danube. So: 'the cap of the captain of the company for steam-powered shipping on the Danube'. The trick is never to read left-to-right; always identify the head first, then chunk back. Real-world examples: die Krankenhausverwaltung (hospital administration: Verwaltung ← Krankenhaus ← Kranken + Haus). der Geschwindigkeitsbegrenzungshinweis (speed-limit indicator sign: Hinweis ← Begrenzung ← Geschwindigkeit). die Lebensversicherungsgesellschaft (life insurance company: Gesellschaft ← Versicherung ← Leben).
Compounds make German vocabulary unbounded
Because compounding is productive (you can invent a new compound on the spot), German doesn't need many phrasal/multiword expressions. English 'apple tree' = two words; German Apfelbaum = one word, registered as one lexical item. English 'driving instructor' = compound noun spelled separately; German Fahrlehrer = welded together. Famous untranslatable compounds: die Schadenfreude (joy at another's misfortune: Schaden + Freude). das Fernweh (longing for far-away places: fern + Weh). das Heimweh (homesickness: Heim + Weh). der Kummerspeck (weight gained from emotional eating: Kummer + Speck). der Ohrwurm (catchy song stuck in your head: Ohr + Wurm). der Drachenfutter ('dragon food' — placating gift to an angry partner: Drache + Futter). die Torschlusspanik (panic about missed life chances: Tor + Schluss + Panik). The structure is always the same — last word = head.
Stress and pronunciation
German compounds are stressed on the first element (the modifier), no matter how long the word. HÁUS-tür, ÁPFEL-saft, ÁUTO-bahn, DÓNAU-dampfschifffahrt. The Grundwort at the end takes secondary stress. Knowing this helps with parsing: when you hear a German speaker hit a stressed syllable hard followed by a long unstressed tail, you're hearing one compound, not multiple words. Spelling: in modern reformed orthography compounds with three identical consonants (Schiff + Fahrt = Schifffahrt with three f's) keep all three. Compounds are written as one word in standard usage; hyphens (Mehrwert-Steuer) appear only for clarity in very long or unusual coinings.
Adjectives and verbs as the first element
The modifier doesn't have to be a noun. Adjective + noun: das Großvater → no, this doesn't exist; correct example der Großvater (grandfather: groß + Vater), die Hochzeit (wedding: hoch + Zeit), das Schwarzbrot (black bread: schwarz + Brot). The adjective is uninflected in compounds. Verb stem + noun: der Schreibtisch (writing desk: schreib- + Tisch), das Fahrrad (bike: fahr- + Rad), die Waschmaschine (washing machine: wasch- + Maschine), der Schlafsack (sleeping bag: schlaf- + Sack). The verb appears as a bare stem (no -en). Numeral / particle + noun: das Halbjahr (half-year), die Vorschau (preview: vor- + Schau), die Nachschau (follow-up: nach- + Schau). In all cases, the rightmost part is still the head and still determines gender.
Quick decoder
(1) See a long German word? Read right-to-left. The rightmost noun is the head and gives the gender. (2) Gender of the compound = gender of the last element. das Auto + die Bahn = die Autobahn. (3) Stress falls on the first element. (4) Look for -s- or -n- between pieces — it's a linking element, not a real syllable. Geburt-s-tag, Sonne-n-blume. (5) Compounds can chain: Kranken + haus + verwaltung = three pieces. Parse from the right. (6) Compounds let you invent vocabulary: if you need a 'children's book table', der Kinderbuchtisch is grammatical even if no one's used it before.
