Which to use
“backed” is a verb and “based” is an adjective - they look or sound alike but fill different roles in a sentence.
- #4,577
- “backed” frequency rank
- #285
- “based” frequency rank
- 4862
- confusion score
Side-by-Side Comparison
| Feature | backed | based |
|---|---|---|
| Definition | simple past and past participle of back | Founded on; having a basis; often used in combining forms. |
Where the eye mixes backed and based
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Visual trap between backed and based
These two trip readers on the page rather than in the ear: backed is /bækt/ while based is /beɪst/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (verb vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 4862, derived from the frequency rank of both members and their visual similarity.
backed is recorded at frequency rank #4,577, classified as averb, pronounced /bækt/. based is at rank #285, tagged as anadj, pronounced /beɪst/.
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 4862, this pair ranks #517,414 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of backed vs based
Shared letters: abde. Private to "backed": ck. Private to "based": s.
"backed" · 6 letters · shape CVCCVC · "based" · 5 letters · shape CVCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "backed" for "based" ever safe?
Which is more common, "backed" or "based"?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "backed" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "based" - compare definitions side by side with the headword page. Word entry
- This pair ranks #517,414 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "backed" and "based" also get mixed up with nearby pairs, the highest-scored neighbour is "backed vs blanked". 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 #517,414 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.