Which to use
“sixth” is an adjective and “sth” is a pronoun - they look or sound alike but fill different roles in a sentence.
- #3,785
- “sixth” frequency rank
- #40,035
- “sth” frequency rank
- 43820
- confusion score
Side-by-Side Comparison
| Feature | sixth | sth |
|---|---|---|
| Definition | The ordinal form of the number six. | Abbreviation of something. |
Letter map: sixth vs sth
Shared letters muted; letters that set sixth and sth apart highlighted. Shared run: 3.
Grammar separator: sixth vs sth
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: sixth is anadjective and sthapronoun. On the page they differ by 2 letter(s) in length. Our composite confusion score for this pair is 43820, derived from the frequency rank of both members and their visual similarity.
sixth is recorded at frequency rank #3,785, classified as anadj, pronounced /sɪksθ/. sth is at rank #40,035, tagged as apron.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 43820, this pair ranks #236,379 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of sixth vs sth
Shared letters: hst. Private to "sixth": ix. Private to "sth": -.
"sixth" · 5 letters · shape CVCCC · "sth" · 3 letters · shape CCC
Known mistypes of this pair
- sixth ← isxth · sitxh · sixht · sixthh · sixtth · sixxth · ssixth · sxith
Frequently Asked Questions
Can "sixth" and "sth" be used interchangeably?
Which is more common, "sixth" or "sth"?
After this comparison
Done with this confusable. These links stay specific to "sixth" and "sth".
- Full dictionary entry for "sixth" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "sth" - compare definitions side by side with the headword page. Word entry
- This pair ranks #236,379 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "sixth" and "sth" also get mixed up with nearby pairs, the highest-scored neighbour is "Sif vs sth". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #236,379 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.