Compound nouns in French combine two words to create a new meaning. Understanding their pluralization and gender is crucial for proper grammar and communication. This article will cover the rules and exceptions for both pluralization and gender determination of compound nouns.

What are Compound Nouns in French? 

Compound nouns in French are combinations of two or more words, often connected by hyphens, that create a single noun with a specific meaning. These structures can include a noun and an adjective, a verb and a noun, or two nouns. Compound nouns are significant in French as they expand vocabulary and enhance expression, enabling precise and nuanced communication.

Rules for Pluralizing French Compound Nouns

General Rules

  1. Nouns, adjectives, and past participles: Follow normal pluralization rules. For example, “un grand-parent” becomes “des grands-parents.”
  2. Verbs, prepositions, adverbs, and pronouns: These elements remain invariable. For example, “un porte-clés” remains “des porte-clés.”

Common Combinations and Their Pluralization Rules

1. Noun + Noun

  • Both nouns become plural if equally important: This occurs when both elements of the compound noun hold equal significance in the term.

Example: un oiseau-mouche (a hummingbird) becomes des oiseaux-mouches.

  • Only the first noun becomes plural if one noun modifies the other: This happens when the second noun acts more like an adjective describing the first noun.

Example: un chou-fleur (a cauliflower) becomes des choux-fleurs.

Example: un soutien-gorge (a bra) becomes des soutiens-gorge.

2. Noun + Adjective

  • Both the noun and the adjective become plural: When a compound noun consists of a noun followed by an adjective, both elements are pluralized.

Example: un coffre-fort (a safe) becomes des coffres-forts.

Example: une belle-fille (a daughter-in-law) becomes des belles-filles.

  • Exceptions: Adjectives ending in -o and the word “demi” remain invariable.

Example: un demi-sœur (a half-sister) becomes des demi-sœurs.

3. Adjective + Adjective

  • Both adjectives become plural: When a compound noun consists of two adjectives, both are pluralized.

Example: une douce-amère (a bittersweet) becomes des douces-amères.

Example: un sourd-muet (a deaf-mute) becomes des sourds-muets.

4. Adverb + Noun

  • Only the noun becomes plural: When a compound noun is formed by an adverb and a noun, the adverb stays the same and only the noun is pluralized.

Example: une arrière-cour (a backyard) becomes des arrière-cours.

Example: un haut-parleur (a loudspeaker) becomes des haut-parleurs.

5. Adverb / Adjective + Past Participle

  • Only the participle becomes plural: When the compound noun consists of an adverb or adjective followed by a past participle, only the participle is pluralized.

Example: un nouveau-né (a newborn) becomes des nouveau-nés.

Example: un bien-aimé (a beloved) becomes des bien-aimés.

6. Preposition + Noun

  • Only the noun becomes plural: In compound nouns formed by a preposition and a noun, the noun is pluralized while the preposition remains unchanged.

Example: une contre-offensive (a counter-offensive) becomes des contre-offensives.

Example: un en-tête (a header) becomes des en-têtes.

7. Verb + Noun

  • Concrete and countable nouns become plural: If the noun in the compound is something concrete and countable, it is pluralized.

Example: un brise-glace (an icebreaker) becomes des brise-glaces.

  • Abstract or collective nouns are traditionally invariable: Abstract or collective nouns typically remain unchanged, though the 1990 spelling reform allows for pluralization.

Example: un porte-monnaie (a purse) can be des porte-monnaie or des porte-monnaies.

8. Verb + Verb

  • Invariable: Compound nouns formed by two verbs remain unchanged in plural form.

Example: un laissez-passer (a pass) becomes des laissez-passer.

Example: un va-et-vient (a coming and going) becomes des va-et-vient.

Determining the Gender of French Compound Nouns

Understanding the gender of French nouns is essential as it significantly impacts grammar, including articles, adjectives, and pronouns. In French, nouns are either masculine or feminine, and this gender affects the agreement of various grammatical elements within a sentence.

General Rules

When it comes to compound nouns—nouns formed by combining two or more words—the gender is usually determined by the structure of the compound. Here’s how the gender is generally assigned based on different combinations:

Common Combinations and Their Gender Rules

Noun + Noun

In compound nouns formed by two nouns, the gender usually matches that of the first noun. This rule helps in predicting the gender of such compound nouns.

  • Examples:
    • un chou-fleur (cauliflower)
    • un oiseau-mouche (hummingbird)
    • une station-service (service station)

Noun + Adjective

For compound nouns that consist of a noun followed by an adjective, the gender aligns with that of the noun. This combination typically follows the same rule as simple nouns.

  • Examples:
    • un coffre-fort (safe)
    • une chauve-souris (bat)
    • une demi-heure (half-hour)

Verb + Noun or Preposition + Noun

When a compound noun is formed by a verb followed by a noun, or a preposition followed by a noun, the resulting compound is usually masculine. However, there are exceptions where the compound can be either masculine or feminine.

  • Examples:
    • un gratte-ciel (skyscraper)
    • un brise-glace (icebreaker)
    • un en-tête (header)
    • Note: Some compounds like après-midi (afternoon) can be either masculine or feminine.

Adjective + Adjective or Adverb + Adjective

For compound nouns formed by combining two adjectives or an adverb and an adjective, the gender is typically determined by the adjectives involved.

  • Examples:
    • la douce-amère (bittersweet)
    • un sourd-muet (deaf-mute)
    • une sourde-muette (deaf-mute, feminine)

The Prefix mi–

Compound nouns that begin with the prefix mi- are almost always feminine. However, there is a notable exception.

  • Examples:
    • la mi-février (mid-February)
    • la mi-hiver (midwinter)
    • Exception: le mi-temps (part-time work) is masculine.

Other Combinations

When it comes to other combinations, compound nouns are typically masculine.

  • Examples:
    • un nouveau-né (newborn)
    • un bien-aimé (beloved)
    • un laissez-passer (pass)

Summary

Understanding the pluralization and gender of French compound nouns is vital for mastering French grammar. Follow rules based on word types (nouns, adjectives, verbs, etc.). For advanced learning, explore La Forêt French class for comprehensive lessons and resources.