Which to use
“ISDN” is an abbrev and “ist” is a verb - they look or sound alike but fill different roles in a sentence.
- #31,114
- “ISDN” frequency rank
- #7
- “ist” frequency rank
- 31121
- confusion score
Side-by-Side Comparison
| Feature | ISDN | ist |
|---|---|---|
| Definition | Internationaler Standard für digitale Telekommunikationsnetze | 3. Person Singular Indikativ Präsens des Verbs sein |
Where the eye mixes ISDN and ist
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. ISDN runs 4 letters (VCCC) against ist's 3 (VCC) - the length gap alone is often enough to separate them once you know to check it.
Look-alike desk: ISDN vs ist
These two trip readers on the page rather than in the ear: ISDN is [ˌiːʔɛsdeːˈʔɛn] while ist is [ɪst]. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (abbrev vs verb), which is usually the fastest check. Our composite confusion score for this pair is 31121, derived from the frequency rank of both members and their visual similarity.
ISDN is recorded at frequency rank #31,114, classified as anabbrev, pronounced [ˌiːʔɛsdeːˈʔɛn]. ist is at rank #7, tagged as averb, pronounced [ɪst].
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 31121, this pair ranks #1,734,387 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of ISDN vs ist
Shared letters: is. Private to "ISDN": dn. Private to "ist": t.
"ISDN" · 4 letters · shape VCCC · "ist" · 3 letters · shape VCC
Known mistypes of this pair
- ISDN ← idsn · isddn · isdnn · issdn
Frequently Asked Questions
Can "ISDN" and "ist" be used interchangeably?
Frequency check: "ISDN" vs "ist" - which ranks higher?
What to do next
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "ISDN" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ist" - compare definitions side by side with the headword page. Word entry
- This pair ranks #1,734,387 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
- "ISDN" and "ist" also get mixed up with nearby pairs, the highest-scored neighbour is "idF vs ISDN". 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 #1,734,387 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.