In English, it's poSSible for a leTTer to oCCur twice in a row, but, except for contrived compound words, a triple consecutive occurrence just doesn't happen.
But it's not clear at all if there is a limit to how many times a letter can occur somewhere in a word, if we don't insist on the occurrences being consecutive. For every letter from A to Z, can you find a word that contains that letter three times? Four? More?
| Letter | Thrice | Quads | Quints | Sexts | Septs |
|---|---|---|---|---|---|
| A | banana | Appalachian | |||
| B | bobby | bubbybush | |||
| C | coccyx | scacchic | circumcrescence | ||
| D | daddy | diddled | |||
| E | epee | defenseless | telemetered | defenselessness | |
| F | fluff | riffraff | |||
| G | giggle | giggling | |||
| H | hashish | thymolsulphonephthalein | |||
| I | invisible | indivisible | indivisibility | indivisibilities | |
| J | jijjin | jejunojejunostomy | |||
| K | kakariki | knickknack | |||
| L | lull | hillbilly | alloplastically | ||
| M | mummy | mummydom | |||
| N | nanny | unintentionally | |||
| O | ovolo | voodoo | monogonoporous | ||
| P | poppy | whippersnapper | |||
| Q | Qaraqalpaq | ||||
| R | error | rearranger | ferriprotoporphyrin | ||
| S | sass | sasses | possessions | possessionless | |
| T | tatty | tattletale | |||
| U | unusual | muumuu | |||
| V | viva-voce | ovoviviparous | |||
| W | wowwing | powwowwing | |||
| X | hexahydroxycyclohexane | ||||
| Y | syzygy | dacryocystosyringotomy | |||
| Z | zizz | razzmatazz |