Which to use
“su” is a noun and “sun” is a name - they look or sound alike but fill different roles in a sentence.
- #8,094
- “su” frequency rank
- #1,154
- “sun” frequency rank
- 9248
- confusion score
Side-by-Side Comparison
| Feature | su | sun |
|---|---|---|
| Definition | Alternative form of xu (“former Vietnamese currency”). | The star that is closest to the Earth. |
Letter map: su vs sun
Shared letters muted; letters that set su and sun apart highlighted. Shared run: 2.
Part-of-speech tell for su / sun
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: su is anoun and sunaname. On the page they differ by 1 extra letter(s) - “su” sits inside “sun”. Our composite confusion score for this pair is 9248, derived from the frequency rank of both members and their visual similarity.
su is recorded at frequency rank #8,094, classified as anoun. 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 9248, this pair ranks #498,351 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of su vs sun
Shared letters: su. Private to "su": -. Private to "sun": n.
"su" · 2 letters · shape CV · "sun" · 3 letters · shape CVC
Frequently Asked Questions
Can "su" and "sun" be used interchangeably?
In ordinary English text, does "su" or "sun" show up more?
Useful next steps
Pair "su" vs "sun" is on the table, pick a follow-up below.
- Full dictionary entry for "su" 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 #498,351 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "su" and "sun" also get mixed up with nearby pairs, the highest-scored neighbour is "su vs sura". Nearby pair
Confusion rank #498,351 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.