Some common words with an uninterrupted string of five consonants are BACKSPLASH, BACKSTRETCH, BACKSTROKE, BIRTHPLACE, BREASTSTROKE, DOWNSTREAM, DOWNTHRUST, DUMBSTRUCK, EIGHTHS, ERSTWHILE, HEARTTHROB, LENGTHS, LIGHTPROOF, MATCHSTICK, NIGHTCLOTHES, NIGHTCLUB, NIGHTDRESS, POSTSCRIPT, STRENGTHS, THOUSANDTHS, THUMBSCREW, TWELFTHS, WARMTHS, and WITCHCRAFT. ANGSTS is the shortest word with five consonants in a row.
These words have six consecutive consonants: ARCHCHRONICLER, CATCHPHRASE, ESCHSCHOLTZIA, HANTZSCHIA, KNIGHTSBRIDGE, LATCHSTRING, POSTPHTHISIC, and WELTSCHMERZ. A popular staple food in Ukraine is a beetroot soup called borsch, which occurs in English dictionaries with a variety of spellings including borshch and borscht, giving rise to plurals containing a string of six consonants: BORSHCHS and BORSCHTS.
HIRSCHSPRUNG'S (DISEASE) has seven consecutive consonants, as does SCHTSCHUROWSKIA. The shortest such word is TSKTSKS. All of these words can be found in major English dictionaries.
Beijing and Fiji have three dotted letters in a row. Other such words are remijia, bogijiab, pirijiri, kharijite, gaijin, Hajji, and hijinks. Ujiji has a string of four dots.
A property development company in the Canadian territory of Nunavut is the Katujjijiit Development Corporation, with six consecutive dotted letters.
In Hungarian, jöjjön (meaning "he should come") has seven dots in a row, if you allow diacritical marks. Incredibly, Finnish has a word with a continuous sequence of 14 dots: pääjääjää (meaning "the main stayer," partitive case).
The alphabetical sequence –RSTU– is contained in OVERSTUFF, OVERSTUDIOUS, OVERSTUNK, UNDERSTUFF, UNDERSTUMBLE, SUPERSTUD, OVERSTUMBLE, SUPERSTUFF, UNDERSTUDY, and BIERSTUBE.
The only other four-letter alphabetical sequence found in English is –MNOP–, which is found, for example, in these words: CREMNOPHOBIA, GYMNOPAEDIC, GYMNOPHOBIA, GYMNOPLAST, LIMNOPHILE, LIMNOPHORA, LIMNOPHORID, LIMNOPLANKTON, SEMNOPITHECINE, SOMNOPATHY, and THAMNOPHILE.
If the alphabet is treated as a continuous loop, however, there is also –YZAB– in ANALYZABLE.
Amazingly, there are some sequences of four repeated letters in words in English dictionaries.
The first citation for "iiwi" in the Oxford English Dictionary is from 1779: "The birds of these islands are as beautiful as any we have seen... its native name is EEEEVE."
ESSSSE (an obsolete word meaning ashes) is in the second edition of the OED.
LLANFAIRPWLLGWYNGYLLGOGERYCHWYRNDROBWLLLLANTYSILIOGOGOGOCH, a town in North Wales, has been described here as having four consecutive Ls. However, in the Welsh alphabet, LL is one letter, entirely separate from L. So in fact this is a double LL rather than a quadruple LLLL as it appears in the English spelling.
BRRRR (an interjection expressive of shivering) is also in the second edition of the OED.
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