Which to use
“rigid” is an adjective and “rigor” is a noun - they look or sound alike but fill different roles in a sentence.
- #10,435
- “rigid” frequency rank
- #26,577
- “rigor” frequency rank
- 37012
- confusion score
Side-by-Side Comparison
| Feature | rigid | rigor |
|---|---|---|
| Definition | Stiff, rather than flexible. | US spelling of rigour. |
Where the eye mixes rigid and rigor
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Visual trap between rigid and rigor
These two trip readers on the page rather than in the ear: rigid is /ˈɹɪd͡ʒ.ɪd/ while rigor is /ˈɹɪɡɚ/. 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 (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 37012, derived from the frequency rank of both members and their visual similarity.
rigid is recorded at frequency rank #10,435, classified as anadj, pronounced /ˈɹɪd͡ʒ.ɪd/. rigor is at rank #26,577, tagged as anoun, pronounced /ˈɹɪɡɚ/.
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 37012, this pair ranks #298,169 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of rigid vs rigor
Shared letters: gir. Private to "rigid": d. Private to "rigor": o.
"rigid" · 5 letters · shape CVCVC · "rigor" · 5 letters · shape CVCVC
Known mistypes of this pair
Frequently Asked Questions
Can "rigid" and "rigor" be used interchangeably?
Frequency check: "rigid" vs "rigor" - which ranks higher?
What to do next
Eye-level mix-up between "rigid" and "rigor" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "rigid" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "rigor" - compare definitions side by side with the headword page. Word entry
- This pair ranks #298,169 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "rigid" and "rigor" also get mixed up with nearby pairs, the highest-scored neighbour is "rigor vs ripon". 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 #298,169 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.