Which to use
“sad” is an adjective and “su” is a noun - they look or sound alike but fill different roles in a sentence.
- #1,536
- “sad” frequency rank
- #8,094
- “su” frequency rank
- 9630
- confusion score
Side-by-Side Comparison
| Feature | sad | su |
|---|---|---|
| Definition | Emotionally negative. | Alternative form of xu (“former Vietnamese currency”). |
Letter map: sad vs su
Shared letters muted; letters that set sad and su apart highlighted. Shared run: 1.
Role in the sentence - sad and su
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: sad is anadjective and suanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 9630, derived from the frequency rank of both members and their visual similarity.
sad is recorded at frequency rank #1,536, classified as anadj, pronounced /ˈsæd/. su is at rank #8,094, 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 9630, this pair ranks #496,397 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of sad vs su
Shared letters: s. Private to "sad": ad. Private to "su": u.
"sad" · 3 letters · shape CVC · "su" · 2 letters · shape CV
Frequently Asked Questions
Can "sad" and "su" be used interchangeably?
Which is more common, "sad" or "su"?
After this comparison
Done with this confusable. These links stay specific to "sad" and "su".
- Full dictionary entry for "sad" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "su" - compare definitions side by side with the headword page. Word entry
- This pair ranks #496,397 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "sad" and "su" also get mixed up with nearby pairs, the highest-scored neighbour is "su vs sura". Nearby pair
Confusion rank #496,397 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.