Which to use
“eta” and “eth” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #17,836
- “eta” frequency rank
- #22,077
- “eth” frequency rank
- 39913
- confusion score
Side-by-Side Comparison
| Feature | eta | eth |
|---|---|---|
| Definition | The seventh letter of the Modern Greek alphabet, the eighth in Old Greek. | A letter (capital Ð, small ð) introduced into Old English to represent its dental fricative, then not distinguished from the letter thorn, no longer used in English but still in modern use in Icelandic, the IPA and other phonetic alphabets to represent the voiced dental fricative "th" sound as in the English word then. The letter is also used in Faroese, but is generally silent in that language. |
Where the spellings diverge
Shared letters are muted; the letters that actually set eta and eth apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
eta and eth form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by a single letter - a in “eta” becomes h in “eth” - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 39913, derived from the frequency rank of both members and their visual similarity.
eta is recorded at frequency rank #17,836, classified as anoun, pronounced /ˈiːtə/. eth is at rank #22,077, tagged as anoun, pronounced /ɛð/.
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 39913, this pair ranks #272,345 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Frequency comparison
Frequently Asked Questions
Can "eta" and "eth" be used interchangeably?
Remembering eta vs eth
The fastest way to pick the right one every time.
- Read both glosses above and match the meaning you intend, only context separates this pair.
- See each word in full, definition, IPA, etymology and its other confusables. Full “eta” entry
- Browse more pairs most likely to be confused. Most confusable