Here is the list of all the English words ending with RR grouped by number of letters: RR, R.R., arr, brr, err, grr, Irr, Orr, PRR, SRR, trr., XRR, ACRR, Barr, birr.
The ending rr is not frequent, but there exists a number of words ending in rr.There are 136 words that end with RR.
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Please note: the Wiktionary contains many more words - in particular proper nouns and inflected forms: plurals of nouns and past tense of verbs - than other English language dictionaries such as the Official Scrabble Players Dictionary (OSPD) from Merriam-Webster, the Official Tournament and Club Word List (OTCWL / OWL / TWL) from the National Scrabble Association, and the Collins Scrabble Words used in the UK (about 180,000 words each). LotsOfWords knows 480,000 words.