Which to use
“SPF” is a noun and “spi” is an adjective - they look or sound alike but fill different roles in a sentence.
- #39,550
- “SPF” frequency rank
- #49,369
- “spi” frequency rank
- 88919
- confusion score
Side-by-Side Comparison
| Feature | SPF | spi |
|---|---|---|
| Definition | Norme de vérification du nom de domaine de l'expéditeur d'un courrier électronique, destinée à réduire le spam, via les DNS. | Spirituel (au sens religieux). |
Where the eye mixes SPF and spi
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. SPF (CCC) and spi (CCV) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Why the eye confuses SPF with spi
These two trip readers on the page rather than in the ear: SPF is \ɛs.pe.ɛf\ while spi is \spi\. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - f in “SPF” becomes i in “spi”, and the parts of speech differ too (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 88919, derived from the frequency rank of both members and their visual similarity.
SPF is recorded at frequency rank #39,550, classified as anoun, pronounced \ɛs.pe.ɛf\. spi is at rank #49,369, tagged as anadj, pronounced \spi\.
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 88919, this pair ranks #6,390 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of SPF vs spi
Shared letters: ps. Private to "SPF": f. Private to "spi": i.
"SPF" · 3 letters · shape CCC · "spi" · 3 letters · shape CCV
Frequently Asked Questions
Is swapping "SPF" for "spi" ever safe?
Frequency check: "SPF" vs "spi" - which ranks higher?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "SPF" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "spi" - compare definitions side by side with the headword page. Word entry
- This pair ranks #6,390 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "SPF" and "spi" also get mixed up with nearby pairs, the highest-scored neighbour is "spi vs suu". Nearby pair
Confusion rank #6,390 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.