Which to use
“scum” and “sum” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #11,112
- “scum” frequency rank
- #4,050
- “sum” frequency rank
- 15162
- confusion score
Side-by-Side Comparison
| Feature | scum | sum |
|---|---|---|
| Definition | A layer of impurities that accumulates at the surface of a liquid (especially molten metal or water). | A quantity obtained by addition or aggregation. |
Where the eye mixes scum and sum
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Visual trap between scum and sum
A purely visual mix-up. scum (/skʌm/) and sum (/sʌm/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 15162, derived from the frequency rank of both members and their visual similarity.
scum is recorded at frequency rank #11,112, classified as anoun, pronounced /skʌm/. sum is at rank #4,050, tagged as anoun, pronounced /sʌm/.
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 15162, this pair ranks #465,697 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of scum vs sum
Shared letters: msu. Private to "scum": c. Private to "sum": -.
"scum" · 4 letters · shape CCVC · "sum" · 3 letters · shape CVC
Known mistypes of this pair
- scum ← csum · sccum · scmu · scumm · sscum · sucm
Frequently Asked Questions
Is swapping "scum" for "sum" ever safe?
Frequency check: "scum" vs "sum" - which ranks higher?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "scum" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "sum" - compare definitions side by side with the headword page. Word entry
- This pair ranks #465,697 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "scum" and "sum" also get mixed up with nearby pairs, the highest-scored neighbour is "SCSI vs scum". 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 #465,697 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.