oco vs Ost, What's the Difference?

Which to use

“oco” is an adjective and “Ost” is a noun - they look or sound alike but fill different roles in a sentence.

#27,951
“oco” frequency rank: #27,958
“Ost” frequency rank: 55909
confusion score

Side-by-Side Comparison

Feature	oco	Ost
Definition	que não tem miolo	leste

Where the eye mixes oco and Ost

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

3 ch

oco

3 ch

Ost

Visual trap between oco and Ost

These two trip readers on the page rather than in the ear: oco is /ˈo.ku/ while Ost is /ɔst/. 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 (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 55909, derived from the frequency rank of both members and their visual similarity.

oco is recorded at frequency rank #27,951, classified as anadj, pronounced /ˈo.ku/. Ost is at rank #27,958, tagged as anoun, pronounced /ɔst/.

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 55909, this pair ranks #10,315 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of oco vs Ost

Shared letters: o. Private to "oco": c. Private to "Ost": st.

"oco" · 3 letters · shape VCV · "Ost" · 3 letters · shape VCC

Frequently Asked Questions

Can "oco" and "Ost" be used interchangeably?

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

Frequency check: "oco" vs "Ost" - which ranks higher?

"oco" is the more common of the two: it sits at frequency rank #27,951 in our Portuguese list, against #27,958 for "Ost". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

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

Full dictionary entry for "oco" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "Ost" - compare definitions side by side with the headword page. Word entry
This pair ranks #10,315 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"oco" and "Ost" also get mixed up with nearby pairs, the highest-scored neighbour is "oni vs Ost". Nearby pair

Confusion rank #10,315 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.