Making a Spanish noun plural is usually easy: you add -s or -es. But a few spelling and accent tricks catch English speakers out, and every adjective and article around the noun has to change too. Let's walk through the rules step by step so your plurals always agree.

The good news? Once you know four or five patterns, you can pluralize almost any word with confidence.

The base rule: +s or +es

  • Ends in a vowel → add -s: casa → casas — house → houses · libro → libros — book → books.
  • Ends in a consonant → add -es: papel → papeles — paper → papers · flor → flores — flower → flowers.
  • Ends in a stressed -í or -ú → usually add -es: rubí → rubíes — ruby → rubies · tabú → tabúes — taboo → taboos.

Words ending in -z change to -ces

When a word ends in -z, the z becomes c before -es. This is a spelling rule, not a pronunciation change.

  • luz → luces — light → lights.
  • lápiz → lápices — pencil → pencils.
  • vez → veces — time (occasion) → times.

Watch the accents (stress) changes

Adding a syllable can move or reveal where the stress falls, so some words gain or lose a written accent in the plural.

  • Accent disappears: canción → canciones — song → songs · examen... wait — see below.
  • Accent disappears: autobús → autobuses — bus → buses · francés → franceses — Frenchman → Frenchmen.
  • Accent appears: joven → jóvenes — young person → young people · examen → exámenes — exam → exams.

Invariable words: same in singular and plural

Some nouns already end in -s in an unstressed final syllable, so only the article changes.

  • Days of the week: el lunes → los lunes — Monday → Mondays · el martes → los martes — Tuesday → Tuesdays.
  • Words ending in -is: la crisis → las crisis — crisis → crises · el análisis → los análisis — analysis → analyses.
  • Others: el paraguas → los paraguas — umbrella → umbrellas.

Adjectives and articles must agree

Everything describing a plural noun goes plural too. Adjectives follow the same +s / +es rule.

el libro nuevo → los libros nuevos · la casa blanca → las casas blancas · un coche azul → unos coches azules

Mixed-gender groups go masculine

When a plural group contains both genders, Spanish uses the masculine plural as the default.

  • los padres — the parents (mother + father), literally the fathers.
  • los reyes — the king and queen (the monarchs).
  • los hermanos — the siblings (brothers and sisters).

Common mistakes English speakers make

  • Forgetting -es after a consonant: it is ciudades, not "ciudads" — city → cities.
  • Leaving the z: write luces, never "luzes."
  • Not making adjectives plural: say los coches rojos, not "los coches rojo."
  • Dropping the accent rule: jóvenes gains an accent even though joven has none.

👉 Read also: Spanish Articles el/la/un/una and Spanish Adjectives: agreement & gender.

Frequently asked questions

How do you make a word plural in Spanish?

Add -s if the word ends in a vowel (casa → casas) and -es if it ends in a consonant (papel → papeles). Words ending in -z change the z to c and add -es (luz → luces). Remember that articles and adjectives around the noun must also become plural.

Why does luz become luces and not luzes?

Spanish spelling avoids the combination "ze," so a final -z is written as c before the plural ending -es. This keeps the sound consistent while following the writing rules. The same happens with lápiz → lápices and vez → veces.

Do adjectives change in the plural in Spanish?

Yes. Adjectives agree with the noun in both number and gender, so they take -s or -es just like nouns. For example, el libro nuevo becomes los libros nuevos, and la casa blanca becomes las casas blancas.