RER
\ɛ.ʁø.ɛʁ\
The verdict
“RER” sits in 20 confusable pairs (corpus #6,746) as a proper noun. The look-alike neighbours are the real trap.
- #6,746
- frequency rank, French
- 5,742
- “R” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Réseau express régional, un chemin de fer desservant l’Île-de-France, en France.
Corpus desk
Index FR-rer · RER · French
RER · rank #6,746 · 0 variants · 20 confusables
- FREQ-COMMON #6,746
- LEN-MID 3 letters
- VOW-1 1 vowel
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-DENSE 5,742
- PHOTO-FINISH reporter
Nearest frequency peer: reporter (-1 rank slots)
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
Voisins de fréquence du confusable « RER »
Pairs de poids proche dans le corpus, séparés des confusables ci-dessous
- remplis
remplis
93,258 corpus weight
- rendra
rendra
93,257 corpus weight
- reporter
reporter
93,256 corpus weight
- RER
RER
93,255 corpus weight
- restez
restez
93,254 corpus weight
- retrouvée
retrouvée
93,252 corpus weight
What this shows Les barres placent « RER » face aux lemmes français les plus proches par rang, pas un reprint du bureau des confusables.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | RER |
| Language | French |
| Part of speech | Proper noun |
| IPA | \ɛ.ʁø.ɛʁ\ |
| Letters | 3 |
| Frequency rank | #6,746 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Rang de corpus près des confusables de « RER »
Easy to mix with look-alikes
The spelling risk for RER is neighbouring look-alikes ("Rh", "RT", …), not just typos; it is aproper noun pronounced \ɛ.ʁø.ɛʁ\. Frequency #6,746 among 5,742 “R” headwords. Gloss: "Réseau express régional, un chemin de fer desservant l’Île-de-France, en France.".
RER doesn't appear in our generated misspelling index, since its letter sequence doesn't invite the usual edit-distance slips. It also participates in 20 confusable-pair relationships, "Rh", "RT", "RP", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
Wiktionary doesn't record an etymology for this headword, so its spelling is best explained by sound-to-letter mapping rather than etymology. The correct French form is RER, spelled R-E-R.
Definition
- 1Réseau express régional, un chemin de fer desservant l’Île-de-France, en France.
Recorded use
Wiktionary examplesThese source excerpts show how RER appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
L’odeur de métal et d’œuf dur si caractéristique du RER B dans les années 90, cette odeur à laquelle on était habitués, était pour moi celle de la liberté.
« Dans ces cas-là, on coupe le courant pour arrêter les trains et empêcher tout risque d’électrocution », indique Mathieu Hemour, responsable du pôle transport RER.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 French corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
How do you spell "RER"?
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Similar French words by spelling shape
Same letter count and similar misspelling depth for "RER", not the corpus desk frequency band.