Which to use
“sour” is an adjective and “STR” is a noun - they look or sound alike but fill different roles in a sentence.
- #8,610
- “sour” frequency rank
- #20,507
- “STR” frequency rank
- 29117
- confusion score
Side-by-Side Comparison
| Feature | sour | STR |
|---|---|---|
| Definition | Tasting of acidity. | Initialism of short tandem repeat. |
Letter map: sour vs STR
Shared letters muted; letters that set sour and STR apart highlighted. Shared run: 2.
Part-of-speech tell for sour / STR
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: sour is anadjective and STRanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 29117, derived from the frequency rank of both members and their visual similarity.
sour is recorded at frequency rank #8,610, classified as anadj, pronounced /ˈsaʊə/. STR is at rank #20,507, tagged as anoun.
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 29117, this pair ranks #365,676 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of sour vs STR
Shared letters: rs. Private to "sour": ou. Private to "STR": t.
"sour" · 4 letters · shape CVVC · "STR" · 3 letters · shape CCC
Known mistypes of this pair
- sour ← osur · soru · sourr · ssour · suor
Frequently Asked Questions
Do "sour" and "STR" mean the same thing in a sentence?
Which is more common, "sour" or "STR"?
What to do next
You've compared "sour" and "STR". Here's where to go from here.
- Full dictionary entry for "sour" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "STR" - compare definitions side by side with the headword page. Word entry
- This pair ranks #365,676 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "sour" and "STR" also get mixed up with nearby pairs, the highest-scored neighbour is "STR vs sura". 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 #365,676 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.