Which to use
“ASTM” is a name and “at” is a preposition - they look or sound alike but fill different roles in a sentence.
- #31,068
- “ASTM” frequency rank
- #21
- “at” frequency rank
- 31089
- confusion score
Side-by-Side Comparison
| Feature | ASTM | at |
|---|---|---|
| Definition | Initialism of American Society for Testing and Materials; former name of ASTM International. | In, near, or in the general vicinity of (a particular place). |
Letter map: ASTM vs at
Shared letters muted; letters that set ASTM and at apart highlighted. Shared run: 2.
Part-of-speech tell for ASTM / at
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: ASTM is aname and atapreposition. On the page they differ by 2 letter(s) in length. Our composite confusion score for this pair is 31089, derived from the frequency rank of both members and their visual similarity.
ASTM is recorded at frequency rank #31,068, classified as aname. at is at rank #21, tagged as aprep, pronounced /æt/.
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 31089, this pair ranks #349,100 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of ASTM vs at
Shared letters: at. Private to "ASTM": ms. Private to "at": -.
"ASTM" · 4 letters · shape VCCC · "at" · 2 letters · shape VC
Known mistypes of this pair
- ASTM ← asmt · asstm · astmm · asttm · atsm · satm
Frequently Asked Questions
Is swapping "ASTM" for "at" ever safe?
Frequency check: "ASTM" vs "at" - which ranks higher?
What to do next
Done with this confusable. These links stay specific to "ASTM" and "at".
- Full dictionary entry for "ASTM" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "at" - compare definitions side by side with the headword page. Word entry
- This pair ranks #349,100 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "ASTM" and "at" 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 #349,100 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.