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Nouns that change meaning with their gender

In French, memorising the gender of a noun is not just about grammatical correctness. Sometimes, getting the article wrong can completely change what you are talking about. A handful of identically spelled nouns exist in both masculine and feminine forms, but they carry completely different meanings depending on whether you use le or la.

English speakers often trip over these words. If you accidentally use the wrong article, a native speaker might be very confused as to why you are trying to read a unit of currency, or why you are wearing a boat part on your head.

Word list
livremA1 book le livre (M) postefA2 post office la poste (F) tourfA2 tower la tour (F) postemB1 position le poste (M) sommefB1 sum la somme (F) sommefB1 sum la somme (F) tourfB1 trick le tour (M) critiqueB2 criticism la critique (F) critiqueB2 critic le critique (M) livrefB2 pound la livre (F) manchefB2 sleeve la manche (F) manchemB2 handle le manche (M) postemB2 shift le poste (M) sommemB2 nap le somme (M) tourmB2 lap le tour (M) vapeurfB2 steam la vapeur (F) tourfC1 rook la tour (F) vapeurmC1 steamship le vapeur (M) voilefC2 sail la voile (F) voilemC2 veil le voile (M)
The classics

Some of the most common words in this category are ones you will encounter early on in your learning journey. For example, un livre is a book, but une livre is a pound, whether as a weight or a currency.

J'ai lu un bon livre.
(I read a good book.)
Ce billet vaut au moins une livre.
(This note is worth at least one pound.)

Another classic is poste. If you are going to send a letter, you go to la poste. However, if you are applying for a job, you are looking for un poste.

Elle travaille à la poste.
(She works at the post office.)
Il cherche un nouveau poste.
(He is looking for a new job.)

Similarly, you must be careful when talking about clothing and tools. The word manche is feminine when talking about a sleeve, but masculine when talking about the handle of a tool.

Il a une tache sur la manche.
(He has a stain on the sleeve.)
Le menuisier a réparé le manche du marteau.
(The carpenter repaired the handle of the hammer.)
Towers, tricks and naps

The word tour is notorious for confusing learners. In the feminine, une tour is a tall building or a rook in chess. In the masculine, un tour is a walk, a lap, a turn or a trick.

Il monte en haut de la tour.
(He climbs to the top of the tower.)
Il a fait un tour du parc.
(He took a walk around the park.)

You will also see this quirk with somme and voile. If you ask for une somme, you are asking for an amount of money or a mathematical sum. If you want a quick sleep, you need un somme. A bride might wear un voile (a veil), while a boat relies on une voile (a sail).

Il va faire un petit somme.
(He is going to take a short nap.)
Les marins ont hissé la voile.
(The sailors hoisted the sail.)
Watch out

You will occasionally encounter nouns where one gender is a common word and the other is a bit outdated or highly specific. For example, la vapeur means steam, but un vapeur refers to an old steamboat.

Be aware that other words outside of this exact list share the quirk. You might hear la mode (fashion) versus le mode (method), la page (page of a book) versus le page (pageboy), or le moule (baking mould) versus la moule (mussel).

Summary

Whenever you learn a new noun, always learn its article at the same time. If a sentence makes absolutely no sense in context, pause and check if the noun has a secret second meaning hiding behind a different gender.