Which to use
“slug” is a noun and “sun” is a name - they look or sound alike but fill different roles in a sentence.
- #19,465
- “slug” frequency rank
- #1,154
- “sun” frequency rank
- 20619
- confusion score
Side-by-Side Comparison
| Feature | slug | sun |
|---|---|---|
| Definition | Any of many gastropod mollusks, having no (or only a rudimentary) shell. | The star that is closest to the Earth. |
Where the eye mixes slug and sun
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses slug with sun
These two trip readers on the page rather than in the ear: slug is /slʌɡ/ while sun is /sʌn/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (noun vs name), which is usually the fastest check. Our composite confusion score for this pair is 20619, derived from the frequency rank of both members and their visual similarity.
slug is recorded at frequency rank #19,465, classified as anoun, pronounced /slʌɡ/. sun is at rank #1,154, tagged as aname, pronounced /sʌn/.
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 20619, this pair ranks #429,853 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of slug vs sun
Shared letters: su. Private to "slug": gl. Private to "sun": n.
"slug" · 4 letters · shape CCVC · "sun" · 3 letters · shape CVC
Known mistypes of this pair
- slug ← lsug · slgu · sllug · slugg · sslug · sulg
Frequently Asked Questions
Is swapping "slug" for "sun" ever safe?
Which is more common, "slug" or "sun"?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "slug" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "sun" - compare definitions side by side with the headword page. Word entry
- This pair ranks #429,853 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "slug" and "sun" also get mixed up with nearby pairs, the highest-scored neighbour is "slug vs slurp". 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 #429,853 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.