AdervsÄtherWhich spelling fits?

Which to use

“Ader” and “Äther” are a confusable German pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#24,600
“Ader” frequency rank
#33,933
“Äther” frequency rank
58533
confusion score

Side-by-Side Comparison

Feature Ader Äther
Definition Bezeichnung für alle Blutgefäße verschiedene organische Verbindungen mit einer Sauerstoffbrücke als funktionelle Gruppe

Where the eye mixes Ader and Äther

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. Ader runs 4 letters (VCVC) against Äther's 5 (VCCVC) - the length gap alone is often enough to separate them once you know to check it.

4 ch
Ader
5 ch
Äther

Why the eye confuses Ader with Äther

A purely visual mix-up. Ader ([ˈaːdɐ]) and Äther ([ˈɛːtɐ]) 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 58533, derived from the frequency rank of both members and their visual similarity.

Ader is recorded at frequency rank #24,600, classified as anoun, pronounced [ˈaːdɐ]. Äther is at rank #33,933, tagged as anoun, pronounced [ˈɛːtɐ].

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 58533, this pair ranks #859,084 of 2,006,359 scored German confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of Ader vs Äther

Shared letters: er. Private to "Ader": ad. Private to "Äther": htä.

"Ader" · 4 letters · shape VCVC  ·  "Äther" · 5 letters · shape VCCVC

Known mistypes of this pair

  • Ader ← adder · aderr · adre · aedr · daer

Frequently Asked Questions

Is swapping "Ader" for "Äther" ever safe?
No. They are said differently ([ˈaːdɐ] versus [ˈɛːtɐ]) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
In ordinary German text, does "Ader" or "Äther" show up more?
"Ader" is the more common of the two: it sits at frequency rank #24,600 in our German list, against #33,933 for "Äther". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Eye-level mix-up between "Ader" and "Äther" is sorted above. Next: full entries or other pairs that share a letter shape.

  • Full dictionary entry for "Ader" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "Äther" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #859,084 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
  • "Ader" and "Äther" also get mixed up with nearby pairs, the highest-scored neighbour is "Äther vs Atze". 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 #859,084 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list