em vs ETA, What's the Difference?

Which to use

“em” is a preposition and “ETA” is an abbrev - they look or sound alike but fill different roles in a sentence.

#7
“em” frequency rank: #18,862
“ETA” frequency rank: 18869
confusion score

Side-by-Side Comparison

Feature	em	ETA
Definition	exprime a ideia de:	Euskadi Ta Askatasuna ("Pátria Basca e Liberdade"), organização paramilitar que defende a independência do País Basco em relação à Espanha.

Where the eye mixes em and ETA

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

2 ch

3 ch

ETA

Look-alike desk: em vs ETA

These two trip readers on the page rather than in the ear: em is /ɐj̃/ while ETA is /ˈɛː.ta/. 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 (preposition vs abbrev), which is usually the fastest check. Our composite confusion score for this pair is 18869, derived from the frequency rank of both members and their visual similarity.

em is recorded at frequency rank #7, classified as aprep, pronounced /ɐj̃/. ETA is at rank #18,862, tagged as anabbrev, pronounced /ˈɛː.ta/.

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 18869, this pair ranks #52,011 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of em vs ETA

Shared letters: e. Private to "em": m. Private to "ETA": at.

"em" · 2 letters · shape VC · "ETA" · 3 letters · shape VCV

Frequently Asked Questions

Do "em" and "ETA" mean the same thing in a sentence?

No - they are not even the same part of speech. "em" is a preposition and "ETA" an abbrev, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "em" or "ETA"?

"em" is the more common of the two: it sits at frequency rank #7 in our Portuguese list, against #18,862 for "ETA". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

Full dictionary entry for "em" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ETA" - compare definitions side by side with the headword page. Word entry
This pair ranks #52,011 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"em" and "ETA" also get mixed up with nearby pairs, the highest-scored neighbour is "ETA vs être". Nearby pair

Confusion rank #52,011 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.