RR

noun

By · According to Wiktionary data (CC BY-SA) ·

"rr" is a 2-letter English headword indexed on PlainSpell.

The verdict

“RR” is a moderately-common English word, ranked #17,232 in English word frequency and used as a noun.

#17,232
frequency rank, English
2
letters
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of railroad.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

RR vs RS
50% similar
RR vs RT
50% similar
RR vs RV
50% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for RR
PropertyValue
HeadwordRR
LanguageEnglish
Part of speechNoun
Letters2
Frequency rank#17,232
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “RR” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). RR lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for RR is 2 letters long, classified as a noun. Corpus data places it at rank #17,232 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 12 distinct senses for this headword, so context determines which meaning a reader should apply.

We couldn't generate a plausible misspelling set for RR, and the word's spelling is regular enough that our generator found nothing worth flagging. It also participates in 20 confusable-pair relationships, "RS", "RT", "RV", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

No explicit etymology string is stored for this entry, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct English form is RR, spelled R-R.

Definition

  1. 1
    Initialism of railroad.
  2. 2
    Initialism of road race.
  3. 3
    Abbreviation of rear, where brevity is desired.
  4. 4
    Initialism of right rear, a location in a square or rectangular layout such as the tires on an automobile or the heating elements on a stovetop.
  5. 5
    Initialism of Rolls-Royce.
  6. 6
    Initialism of reverse racism.
  7. 7
    Initialism of real reality.
  8. 8
    Initialism of relative risk.
  9. 9
    Initialism of rural route used when addressing mail.
  10. 10
    Initialism of Riva-Roccin, a blood pressure measurer device.
  11. 11
    Initialism of role reversal.
  12. 12
    Initialism of resource record.

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 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "RR"?
"RR" is spelled R-R.
What does "RR" mean?
As a noun, "RR" means: Initialism of railroad.
What words are commonly confused with "RR"?
"RR" is commonly confused with "RS", "RT", "RV". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
What language does "RR" come from?
"RR" is a English word. PlainSpell's reference spans five languages -- English, Spanish, Portuguese, French, and German -- with definitions, pronunciations, and spelling data for each.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “RR”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is R-R - every other letter order is a misspelling in standard orthography.
  • Don't mix it up with “RS” - see the side-by-side comparison. RR vs RS
  • Browse more English words and confusable pairs in the same reference. English words
Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list