Which to use
“fall” is a verb and “fast” is an adjective - they look or sound alike but fill different roles in a sentence.
- #766
- “fall” frequency rank
- #767
- “fast” frequency rank
- 1533
- confusion score
Side-by-Side Comparison
| Feature | fall | fast |
|---|---|---|
| Definition | To be moved downwards. | Firmly or securely fixed in place; stable. |
Where the eye mixes fall and fast
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Spelling & Dictionary Insight
These two trip readers on the page rather than in the ear: fall is /fɔːl/ while fast is /fɑːst/. 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 (verb vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 1533, derived from the frequency rank of both members and their visual similarity.
fall is recorded at frequency rank #766, classified as averb, pronounced /fɔːl/. fast is at rank #767, 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 1533, this pair ranks #527,238 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of fall vs fast
Shared letters: af. Private to "fall": l. Private to "fast": st.
"fall" · 4 letters · shape CVCC · "fast" · 4 letters · shape CVCC