The plural of compound nouns (2) in French

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The plural of compound nouns (2)

Reminder: in compound nouns, constituent words that are adjectives and nouns are written in their plural form.

mon grand-pùre → mes grands-pùres (adjectif + nom) my grandfather →my grandfathers (adjective + noun: both are in the plural)
un chirurgien-dentiste → des chirurgiens-dentistes (nom + nom) a dental surgeon → dental surgeons (noun + noun)

However, if the compound noun is made up of two nouns separated by a preposition (et, en, Ă , etc.), only the first of the two is written in the plural.

un chef-d'Ɠuvre → des chefs-d'Ɠuvre a masterpiece → masterpieces
un arc-en-ciel → des arcs-en-ciel a rainbow → rainbows
une pomme de terre → des pommes de terre a potato → potatoes

Certain words which make up compound nouns are written with a plural ending if they function as a noun, but without one if they function as a verb.

des porte-clés (porte au singulier car il s'agit du verbe porter) key rings (porte is written without an -s because it comes from the verb porter, 'to carry' or 'to bear')
des portes-fenĂȘtres (portes au pluriel car il s'agit du nom une porte) French windows, French doors (portes is the plural form of the noun meaning 'a door')
des garde-manger (endroit ou l'on garde le manger, garde est un verbe) pantries, larders (garde is written without an -s because it comes from the verb garder, 'to keep' or 'to store')
des gardes-malades (gardes est un nom) live-in nurses, carers (gardes is the plural form of the noun meaning 'a guard')

Exceptions:
‱ The nouns pot-au-feu (a dish of boiled beef), tĂȘte-Ă -tĂȘte (a one-on-one conversation) and coq-Ă -l'Ăąne (the act of suddenly changing the subject) never take an -s.
‱ Latin words are also invariable, for example: des nota bene (notes, NBs), des mea-culpa (admissions of guilt), des post-scriptum (postscripts).

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