spi vs sul, What's the Difference?

Which to use

“spi” is an adjective and “sul” is an article - they look or sound alike but fill different roles in a sentence.

#49,369
“spi” frequency rank: #33,033
“sul” frequency rank: 82402
confusion score

Side-by-Side Comparison

Feature	spi	sul
Definition	Spirituel (au sens religieux).	Sur le.

Where the spellings diverge

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

3 ch

spi

3 ch

sul

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: spi is \spi\ while sul is \ˈsul\. 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 article), which is usually the fastest check. Our composite confusion score for this pair is 82402, derived from the frequency rank of both members and their visual similarity.

spi is recorded at frequency rank #49,369, classified as anadj, pronounced \spi\. sul is at rank #33,033, tagged as anarticle, pronounced \ˈsul\.

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 82402, this pair ranks #16,808 of 440,172 scored French confusable pairs - among the most confusable pairs.

Orthographic DNA of spi vs sul

Shared letters: s. Private to "spi": ip. Private to "sul": lu.

"spi" · 3 letters · shape CCV · "sul" · 3 letters · shape CVC

Frequency comparison

spi#49,369

sul#33,033

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "spi" and "sul" be used interchangeably?

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

Which is more common, "spi" or "sul"?

"sul" is the more common of the two: it sits at frequency rank #33,033 in our French list, against #49,369 for "spi". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering spi vs sul

The fastest way to pick the right one every time.

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