Which to use
“fase” is a noun and “fast” is an adjective - they look or sound alike but fill different roles in a sentence.
- #2,293
- “fase” frequency rank
- #16,583
- “fast” frequency rank
- 18876
- confusion score
Side-by-Side Comparison
| Feature | fase | fast |
|---|---|---|
| Definition | Cada uno de los diversos aspectos que presenta un fenómeno natural o una cosa, doctrina, proceso, etc. | Rápido, veloz. |
Where the eye mixes fase and fast
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Look-alike desk: fase vs fast
These two trip readers on the page rather than in the ear: fase is [ˈfase] while fast is /fɑːst/. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - e in “fase” becomes t in “fast”, and the parts of speech differ too (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 18876, derived from the frequency rank of both members and their visual similarity.
fase is recorded at frequency rank #2,293, classified as anoun, pronounced [ˈfase]. fast is at rank #16,583, tagged as anadj, pronounced /fɑːst/.
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 18876, this pair ranks #266,110 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of fase vs fast
Shared letters: afs. Private to "fase": e. Private to "fast": t.
"fase" · 4 letters · shape CVCV · "fast" · 4 letters · shape CVCC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "fase" for "fast" ever safe?
Frequency check: "fase" vs "fast" - which ranks higher?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "fase" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fast" - compare definitions side by side with the headword page. Word entry
- This pair ranks #266,110 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "fase" and "fast" also get mixed up with nearby pairs, the highest-scored neighbour is "fast vs fuste". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #266,110 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.