Agent and Instrument Nouns | Dutch Grammar

When you want to name the person who does something, or the device that does it, Dutch reaches for a small family of suffixes glued onto a verb stem. English does the same thing with -er: bake → baker, open → opener. Dutch -er works almost identically, which makes this one of the friendliest corners of Dutch word formation for an English speaker — but there are extra suffixes (-aar, -ster, -ier) with their own niches, and a gender fact that English doesn't prepare you for: practically every agent and instrument noun is a de-word. This page shows you how to build them and read them.

-er: the workhorse suffix

The default way to turn a verb into "one who does it" or "the thing that does it" is to add -er to the verb stem (the infinitive minus -en). The same suffix covers both people and machines, exactly as in English.

People (agent nouns):

bakken (to bake) → de bakker (baker)
werken (to work) → de werker (worker)
zwemmen (to swim) → de zwemmer (swimmer)
spelen (to play) → de speler (player)
lopen (to walk/run) → de loper (walker/runner)

De bakker op de hoek begint elke ochtend om vier uur.

The baker on the corner starts every morning at four.

Hij is een hele snelle zwemmer geworden dit seizoen.

He's become a really fast swimmer this season.

Things (instrument nouns) — the same suffix names the device that performs the action:

openen (to open) → de opener (opener)
stofzuigen (to vacuum) → de stofzuiger (vacuum cleaner)
föhnen (to blow-dry) → de föhn / de haardroger (hairdryer)
koelen (to cool) → de koeler (cooler)
wekken (to wake) → de wekker (alarm clock)

De stofzuiger is kapot, ik moet straks vegen.

The vacuum cleaner is broken, I'll have to sweep later.

Mijn wekker ging vanmorgen niet af, daarom ben ik te laat.

My alarm clock didn't go off this morning, that's why I'm late.

Spelling at the join

Dutch spelling rules apply when you add -er, so the stem can change shape:

A long vowel written double in a closed syllable becomes single when the syllable opens: lopen → loop → loper.
A stem-final consonant after a short vowel doubles to keep the vowel short: zwemmen → zwem → zwemmer; bakken → bak → bakker.
A stem ending in -v or -z shifts to -f- or -s-: schrijven → schrijver (writer), reizen → reiziger (traveller, with the extra -ig-).

De schrijver van dat boek woont vlakbij ons.

The writer of that book lives near us.

-aar: after -el, -en, -er stems

When the verb stem already ends in an unstressed -el, -en, or -er, adding plain -er would be clumsy to pronounce (handeler, leraer). Dutch instead uses -aar:

handelen (to trade) → de handelaar (trader, dealer)
leren → de leraar (teacher) — note the stem ler-
liegen / leugen → de leugenaar (liar)
winnen → de winnaar (winner)
bedelen (to beg) → de bedelaar (beggar)
redden → de redder (rescuer) keeps -er, but toveren → de tovenaar (wizard) takes -aar

De winnaar van de wedstrijd krijgt een beker.

The winner of the contest gets a cup/trophy.

Geloof hem niet, hij is een grote leugenaar.

Don't believe him, he's a big liar.

💡

The choice between -er and -aar is mostly about pronunciation: after a stem ending in -el / -en / -er, Dutch prefers -aar (handelaar, winnaar, leugenaar). After most other stems it's plain -er. There are leftovers to memorise (leraar, tovenaar), but the sound-rule covers the majority.

-ier and a few minor patterns

A small, mostly older group uses -ier (often borrowed from French -ier), typically stressed on the suffix:

de kassier (cashier)
de herbergier (innkeeper)
de tuinier (gardener)

De kassier vroeg of ik contant of met pin wilde betalen.

The cashier asked whether I wanted to pay cash or by card.

-ster: the (historically) female suffix

Traditionally, the female counterpart of an -er agent noun was formed with -ster (or -es in some words):

de verpleger → de verpleegster (male/female nurse)
de zwemmer → de zwemster (female swimmer)
de werker → de werkster (female worker; werkster now specifically means "cleaning lady")
de leraar → de lerares (female teacher, with -es)

In modern usage there's a strong trend toward using the -er form for everyone regardless of gender — zij is een goede zwemmer is now perfectly normal. Some -ster forms have also drifted to a separate meaning (werkster), so they aren't always a neutral feminine of the -er word. Treat -ster as a form you must recognise, while defaulting to -er when you produce.

Mijn tante werkte vroeger als verpleegster in het ziekenhuis.

My aunt used to work as a nurse in the hospital.

Zij is de beste speler van het team.

She is the best player on the team — the -er form is used for a woman too in modern Dutch.

They are (almost) all de-words

Here is the gender fact English doesn't warn you about: agent and instrument nouns built with -er, -aar, -ier, -ster are de-words, both the people and the machines. This is exceptionless enough to treat as a rule.

de bakker, de leraar, de winnaar, de kassier, de verpleegster — people
de opener, de stofzuiger, de wekker, de koeler — machines

So you say de nieuwe stofzuiger (not het), die opener (not dat), een goede leraar. Because they're de-words, the attributive adjective always takes -e.

Heb je die nieuwe opener gezien? Hij werkt veel beter.

Have you seen that new opener? It works much better — 'die' and 'hij' because it's a de-word.

Common Mistakes

❌ de leerer → ✅ de leraar

The teacher. The stem 'ler-' takes -aar, not -er; and note the single spelling 'leraar'.

❌ de handeler → ✅ de handelaar

The trader/dealer. Stems ending in -el take -aar (handelaar), not -er.

❌ het stofzuiger → ✅ de stofzuiger

The vacuum cleaner. All -er instrument nouns are de-words, even machines.

❌ een goed leraar → ✅ een goede leraar

A good teacher. Because agent nouns are de-words, the adjective takes -e.

❌ Zij is een goede zwemster, dus zij is geen zwemmer. → ✅ Zij is een goede zwemmer/zwemster.

She's a good swimmer. The -er form is now standard for women too; -ster still exists but isn't required.

Key Takeaways

-er is the default agent/instrument suffix and covers both people (bakker) and machines (opener) — just like English -er.
Use -aar after stems ending in -el/-en/-er (handelaar, winnaar, leugenaar); a few forms (leraar, tovenaar) just have to be learned.
-ster / -es are historically female (verpleegster, lerares); modern Dutch increasingly uses -er for everyone — produce -er, but recognise -ster.
Almost all of these nouns are de-words, so the adjective takes -e.

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