Which to use
“catalysis” and “catalyst” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #42,052
- “catalysis” frequency rank
- #10,177
- “catalyst” frequency rank
- 52229
- confusion score
Side-by-Side Comparison
| Feature | catalysis | catalyst |
|---|---|---|
| Definition | The increase of the rate of a chemical reaction, induced by a catalyst. | A substance that increases the rate of a chemical reaction without being consumed in the process. |
Where the eye mixes catalysis and catalyst
Muted = shared; highlighted = the visual trap. They share 7 letters in sequence.
Look-alike desk: catalysis vs catalyst
A purely visual mix-up. catalysis (/kəˈtæləsɪs/) and catalyst (/ˈkæt.ɪ.lɪst/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 52229, derived from the frequency rank of both members and their visual similarity.
catalysis is recorded at frequency rank #42,052, classified as anoun, pronounced /kəˈtæləsɪs/. catalyst is at rank #10,177, tagged as anoun, pronounced /ˈkæt.ɪ.lɪst/.
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 52229, this pair ranks #158,803 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of catalysis vs catalyst
Shared letters: aclsty. Private to "catalysis": i. Private to "catalyst": -.
"catalysis" · 9 letters · shape CVCVCVCVC · "catalyst" · 8 letters · shape CVCVCVCC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "catalysis" for "catalyst" ever safe?
In ordinary English text, does "catalysis" or "catalyst" show up more?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "catalysis" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "catalyst" - compare definitions side by side with the headword page. Word entry
- This pair ranks #158,803 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "catalysis" and "catalyst" also get mixed up with nearby pairs, the highest-scored neighbour is "catalysis vs catalytic". 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 #158,803 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.