Which to use
“sick” is an adjective and “stack” is a noun - they look or sound alike but fill different roles in a sentence.
- #31,561
- “sick” frequency rank
- #38,497
- “stack” frequency rank
- 70058
- confusion score
Side-by-Side Comparison
| Feature | sick | stack |
|---|---|---|
| Definition | doente | acúmulo, especialmente organizado no eixo vertical; pilha |
Where the eye mixes sick and stack
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Look-alike desk: sick vs stack
These two trip readers on the page rather than in the ear: sick is /sɪk/ while stack is /stæk/. 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 (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 70058, derived from the frequency rank of both members and their visual similarity.
sick is recorded at frequency rank #31,561, classified as anadj, pronounced /sɪk/. stack is at rank #38,497, tagged as anoun, pronounced /stæk/.
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 70058, this pair ranks #3,753 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.
Orthographic DNA of sick vs stack
Shared letters: cks. Private to "sick": i. Private to "stack": at.
"sick" · 4 letters · shape CVCC · "stack" · 5 letters · shape CCVCC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "sick" for "stack" ever safe?
Frequency check: "sick" vs "stack" - which ranks higher?
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 "sick" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "stack" - compare definitions side by side with the headword page. Word entry
- This pair ranks #3,753 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "sick" and "stack" also get mixed up with nearby pairs, the highest-scored neighbour is "sick vs sire". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #3,753 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.