Which to use
“sly” is an adjective and “spy” is a noun - they look or sound alike but fill different roles in a sentence.
- #47,613
- “sly” frequency rank
- #37,565
- “spy” frequency rank
- 85178
- confusion score
Side-by-Side Comparison
| Feature | sly | spy |
|---|---|---|
| Definition | Matois, malin. | Espion. |
Where the eye mixes sly and spy
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. sly and spy follow the identical consonant-vowel pattern (CCV). Same shape at a glance is often the real trap, independent of shared letters.
Why the eye confuses sly with spy
These two trip readers on the page rather than in the ear: sly is \ˈslaɪ\ while spy is \spaɪ\. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - l in “sly” becomes p in “spy”, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 85178, derived from the frequency rank of both members and their visual similarity.
sly is recorded at frequency rank #47,613, classified as anadj, pronounced \ˈslaɪ\. spy is at rank #37,565, tagged as anoun, pronounced \spaɪ\.
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 85178, this pair ranks #11,764 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of sly vs spy
Shared letters: sy. Private to "sly": l. Private to "spy": p.
"sly" · 3 letters · shape CCV · "spy" · 3 letters · shape CCV
Frequently Asked Questions
Can "sly" and "spy" be used interchangeably?
In ordinary French text, does "sly" or "spy" show up more?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "sly" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "spy" - compare definitions side by side with the headword page. Word entry
- This pair ranks #11,764 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "sly" and "spy" also get mixed up with nearby pairs, the highest-scored neighbour is "sly vs suu". Nearby pair
Confusion rank #11,764 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.