Which to use
“fast” is an adjective and “flash” is a noun - they look or sound alike but fill different roles in a sentence.
- #16,583
- “fast” frequency rank
- #7,025
- “flash” frequency rank
- 23608
- confusion score
Side-by-Side Comparison
| Feature | fast | flash |
|---|---|---|
| Definition | Rápido, veloz. | Tipo de helado elaborado a partir de jugo de frutas naturales o de una solución azucarada con colorantes y saborizantes artificiales que se envuelve en un empaque o bolsa de plástico sellada que tiene usualmente una forma cilíndrica y alargada, la cual es posteriormente congelada. |
Where the spellings diverge
Shared letters are muted; the letters that actually set fast and flash apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
fast and flash form a confusable pair in the Spanish index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by 1 letter(s) in length - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 23608, derived from the frequency rank of both members and their visual similarity.
fast is recorded at frequency rank #16,583, classified as anadj, pronounced /fɑːst/. flash is at rank #7,025, tagged as anoun, pronounced [ˈflaʃ].
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 23608, this pair ranks #244,979 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.
Frequency comparison
Frequently Asked Questions
Can "fast" and "flash" be used interchangeably?
Remembering fast vs flash
The fastest way to pick the right one every time.
- Check the role first: if you need an adjective, it's “fast”; for a noun, it's “flash”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “fast” entry
- Browse more pairs most likely to be confused. Most confusable