Which to use
“asthma” is a noun and “ASTM” is a name - they look or sound alike but fill different roles in a sentence.
- #10,650
- “asthma” frequency rank
- #31,068
- “ASTM” frequency rank
- 41718
- confusion score
Side-by-Side Comparison
| Feature | asthma | ASTM |
|---|---|---|
| Definition | A long-term respiratory condition, in which the airways may unexpectedly and suddenly narrow, often in response to an allergen, cold air, exercise, or emotional stress. Symptoms include wheezing, shortness of breath, chest tightness, and coughing. | Initialism of American Society for Testing and Materials; former name of ASTM International. |
Letter map: asthma vs ASTM
Shared letters muted; letters that set asthma and ASTM apart highlighted. Shared run: 4. asthma runs 6 letters (VCCCCV) against ASTM's 4 (VCCC) - the length gap alone is often enough to separate them once you know to check it.
Role in the sentence - asthma and ASTM
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: asthma is anoun and ASTManame. On the page they differ by 2 letter(s) in length. Our composite confusion score for this pair is 41718, derived from the frequency rank of both members and their visual similarity.
asthma is recorded at frequency rank #10,650, classified as anoun, pronounced /ˈasmə/. ASTM is at rank #31,068, tagged as aname.
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 41718, this pair ranks #255,715 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of asthma vs ASTM
Shared letters: amst. Private to "asthma": h. Private to "ASTM": -.
"asthma" · 6 letters · shape VCCCCV · "ASTM" · 4 letters · shape VCCC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "asthma" for "ASTM" ever safe?
Frequency check: "asthma" vs "ASTM" - which ranks higher?
What to do next
You've compared "asthma" and "ASTM". Here's where to go from here.
- Full dictionary entry for "asthma" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ASTM" - compare definitions side by side with the headword page. Word entry
- This pair ranks #255,715 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "asthma" and "ASTM" also get mixed up with nearby pairs, the highest-scored neighbour is "Asta vs ASTM". 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 #255,715 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.