eco vs ei, What's the Difference?

Which to use

“eco” is an intj and “ei” is a noun - they look or sound alike but fill different roles in a sentence.

#7,146
“eco” frequency rank: #2,629
“ei” frequency rank: 9775
confusion score

Side-by-Side Comparison

Feature	eco	ei
Definition	expressa nojo	ovo

Where the eye mixes eco and ei

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch

eco

2 ch

Look-alike desk: eco vs ei

These two trip readers on the page rather than in the ear: eco is /ˈɛ.ku/ while ei is /ˈɛɪ/. 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 (intj vs noun), which is usually the fastest check. Our composite confusion score for this pair is 9775, derived from the frequency rank of both members and their visual similarity.

eco is recorded at frequency rank #7,146, classified as anintj, pronounced /ˈɛ.ku/. ei is at rank #2,629, tagged as anoun, pronounced /ˈɛɪ/.

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 9775, this pair ranks #63,540 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of eco vs ei

Shared letters: e. Private to "eco": co. Private to "ei": i.

"eco" · 3 letters · shape VCV · "ei" · 2 letters · shape VV

Frequently Asked Questions

Is swapping "eco" for "ei" ever safe?

No - they are not even the same part of speech. "eco" is an intj and "ei" a noun, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "eco" or "ei"?

"ei" is the more common of the two: it sits at frequency rank #2,629 in our Portuguese list, against #7,146 for "eco". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

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

Full dictionary entry for "eco" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ei" - compare definitions side by side with the headword page. Word entry
This pair ranks #63,540 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"eco" and "ei" also get mixed up with nearby pairs, the highest-scored neighbour is "eco vs elio". Nearby pair

Confusion rank #63,540 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.