infeçãovsinjeçãoConfusable pair

Which to use

“infeção” and “injeção” are a confusable Portuguese pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#40,622
“infeção” frequency rank
#9,512
“injeção” frequency rank
50134
confusion score

Side-by-Side Comparison

Feature infeção injeção
Definition invasão de micro-organismos patogénicos ato ou efeito de injetar

Letter map: infeção vs injeção

Shared letters muted; letters that set infeção and injeção apart highlighted. Shared run: 6. infeção and injeção follow the identical consonant-vowel pattern (VCCVCVV). Same shape at a glance is often the real trap, independent of shared letters.

7 ch
infeção
7 ch
injeção

Pair insight - infeção / injeção

infeção and injeção are indexed as a confusable Portuguese pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they differ by a single letter - f in “infeção” becomes j in “injeção”. Our composite confusion score for this pair is 50134, derived from the frequency rank of both members and their visual similarity.

infeção is recorded at frequency rank #40,622, classified as anoun. injeção is at rank #9,512, tagged as anoun, pronounced /ĩ.ʒɛ.ˈsɐ̃w̃/.

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 50134, this pair ranks #14,843 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of infeção vs injeção

Shared letters: einoãç. Private to "infeção": f. Private to "injeção": j.

"infeção" · 7 letters · shape VCCVCVV  ·  "injeção" · 7 letters · shape VCCVCVV

Frequently Asked Questions

Is swapping "infeção" for "injeção" ever safe?
No. They differ by a single letter - f in “infeção” becomes j in “injeção”, but the dictionary glosses above give them different meanings, so swapping one for the other changes what the sentence says.
In ordinary Portuguese text, does "infeção" or "injeção" show up more?
"injeção" is the more common of the two: it sits at frequency rank #9,512 in our Portuguese list, against #40,622 for "infeção". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Pair "infeção" vs "injeção" is on the table, pick a follow-up below.

  • Full dictionary entry for "infeção" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "injeção" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #14,843 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
  • "infeção" and "injeção" also get mixed up with nearby pairs, the highest-scored neighbour is "infeção vs inflexão". Nearby pair

Confusion rank #14,843 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list