za vs zu, What's the Difference?

Which to use

“za” is a preposition and “zu” is an adjective - they look or sound alike but fill different roles in a sentence.

#37,595
“za” frequency rank: #39,935
“zu” frequency rank: 77530
confusion score

Side-by-Side Comparison

Feature	za	zu
Definition	durante	fechado

Where the eye mixes za and zu

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

2 ch

Visual trap between za and zu

These two trip readers on the page rather than in the ear: za is /ˈza/ ouvir^(fonte ?) while zu is /t͡suː/. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - a in “za” becomes u in “zu”, and the parts of speech differ too (preposition vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 77530, derived from the frequency rank of both members and their visual similarity.

za is recorded at frequency rank #37,595, classified as aprep, pronounced /ˈza/ ouvir^(fonte ?). zu is at rank #39,935, tagged as anadj, pronounced /t͡suː/.

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 77530, this pair ranks #1,860 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of za vs zu

Shared letters: z. Private to "za": a. Private to "zu": u.

"za" · 2 letters · shape CV · "zu" · 2 letters · shape CV

Frequently Asked Questions

Is swapping "za" for "zu" ever safe?

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

Which is more common, "za" or "zu"?

"za" is the more common of the two: it sits at frequency rank #37,595 in our Portuguese list, against #39,935 for "zu". 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 "za" and "zu" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "za" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "zu" - compare definitions side by side with the headword page. Word entry
This pair ranks #1,860 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"za" and "zu" also get mixed up with nearby pairs, the highest-scored neighbour is "zag vs zu". Nearby pair

Confusion rank #1,860 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.