Understanding Dutch word formation — how Dutch builds new words from roots, prefixes, and suffixes — dramatically accelerates vocabulary acquisition. Dutch is a compound language: new words are formed by stacking existing words together. Once you know werk (work), dag (day), and boek (book), you can decode werkdag (workday), werkboek (workbook), dagboek (diary/daybook), and dagwerk (day’s work) without looking them up.
Key Dutch prefixes to learn: be- (makes verbs transitive: kijken → bekijken), ge- (past participle marker, also nouns: gebouw = building), ont- (un-/de-: ontmaskeren = unmask), ver- (change of state: veranderen = to change), her- (re-: herhalen = repeat). Key suffixes: -heid (abstract nouns: vrijheid = freedom), -lijk (adjectives: vriendelijk = friendly), -ing (action nouns: vergadering = meeting), -er (agent nouns: werker = worker).
Compound nouns are the most productive pattern. The gender (article) of a compound is always the gender of the last element: de deur + het knop → de deurknop (the doorknob) takes de because the last element is incorrect — actually de knop → de deurknop. Learning word-formation rules means every new root word you learn potentially unlocks 5–10 derived and compound words simultaneously.