sly vs sud, What's the Difference?

Which to use

“sly” is an adjective and “sud” is a noun - they look or sound alike but fill different roles in a sentence.

#47,613
“sly” frequency rank: #439
“sud” frequency rank: 48052
confusion score

Side-by-Side Comparison

Feature	sly	sud
Definition	Matois, malin.	Point cardinal opposé au nord ; direction du pôle de l’hémisphère austral et correspondant à l’azimut 180°.

Where the spellings diverge

Shared letters are muted; the letters that actually set sly and sud apart are highlighted. They share 1 letter in sequence, which is exactly why the eye skips the difference.

3 ch

sly

3 ch

sud

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: sly is \ˈslaɪ\ while sud is \syd\. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 48052, 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\. sud is at rank #439, tagged as anoun, pronounced \syd\.

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 48052, this pair ranks #182,029 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of sly vs sud

Shared letters: s. Private to "sly": ly. Private to "sud": du.

"sly" · 3 letters · shape CCV · "sud" · 3 letters · shape CVC

Frequency comparison

sly#47,613

sud#439

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "sly" and "sud" be used interchangeably?

No - they are not even the same part of speech. "sly" is an adjective and "sud" a noun, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "sly" or "sud"?

"sud" is the more common of the two: it sits at frequency rank #439 in our French list, against #47,613 for "sly". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Remembering sly vs sud

The fastest way to pick the right one every time.

Check the role first: if you need an adjective, it's “sly”; for a noun, it's “sud”.
See each word in full, definition, IPA, etymology and its other confusables. Full “sly” entry
Browse more pairs most likely to be confused. Most confusable