einvsejeWhat's the difference?

Quick tell: ein is a num, eje is a noun, so they fill different roles in a sentence.

Which to use

“ein” is a num and “eje” is a noun - they look or sound alike but fill different roles in a sentence.

#36,010
“ein” frequency rank
#4,077
“eje” frequency rank
40087
confusion score

Side-by-Side Comparison

Feature ein eje
Definition Un uno. Pieza cilíndrica que atraviesa un cuerpo giratorio.

Where the eye mixes ein and eje

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

3 ch
ein
3 ch
eje

Why the eye confuses ein with eje

These two trip readers on the page rather than in the ear: ein is [aɪ̯n] while eje is [ˈexe]. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (num vs noun), which is usually the fastest check. Our composite confusion score for this pair is 40087, derived from the frequency rank of both members and their visual similarity.

ein is recorded at frequency rank #36,010, classified as anum, pronounced [aɪ̯n]. eje is at rank #4,077, tagged as anoun, pronounced [ˈexe].

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 40087, this pair ranks #160,971 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ein vs eje

Shared letters: e. Private to "ein": in. Private to "eje": j.

"ein" · 3 letters · shape VVC  ·  "eje" · 3 letters · shape VCV

Frequently Asked Questions

Is swapping "ein" for "eje" ever safe?
No - they are not even the same part of speech. "ein" is a num and "eje" a noun, so a sentence built for one is usually ungrammatical with the other.
Frequency check: "ein" vs "eje" - which ranks higher?
"eje" is the more common of the two: it sits at frequency rank #4,077 in our Spanish list, against #36,010 for "ein". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

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 "ein" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "eje" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #160,971 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "ein" and "eje" also get mixed up with nearby pairs, the highest-scored neighbour is "ein vs EPL". Nearby pair

Confusion rank #160,971 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list