Which to use
“alarm” and “alum” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #4,426
- “alarm” frequency rank
- #20,832
- “alum” frequency rank
- 25258
- confusion score
Side-by-Side Comparison
| Feature | alarm | alum |
|---|---|---|
| Definition | A summons to arms, as on the approach of an enemy. | An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K₂SO₄·Al₂(SO₄)₃·24H₂O). |
Where the eye mixes alarm and alum
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Visual trap between alarm and alum
A purely visual mix-up. alarm (/əˈlɑːm/) and alum (/ˈæl.əm/) 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 25258, derived from the frequency rank of both members and their visual similarity.
alarm is recorded at frequency rank #4,426, classified as anoun, pronounced /əˈlɑːm/. alum is at rank #20,832, tagged as anoun, pronounced /ˈæl.əm/.
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 25258, this pair ranks #395,701 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of alarm vs alum
Shared letters: alm. Private to "alarm": r. Private to "alum": u.
"alarm" · 5 letters · shape VCVCC · "alum" · 4 letters · shape VCVC
Known mistypes of this pair
Frequently Asked Questions
Do "alarm" and "alum" mean the same thing in a sentence?
Which is more common, "alarm" or "alum"?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "alarm" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "alum" - compare definitions side by side with the headword page. Word entry
- This pair ranks #395,701 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "alarm" and "alum" also get mixed up with nearby pairs, the highest-scored neighbour is "algo vs alum". 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 #395,701 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.