nacidosvsnocivosTell them apart

Quick tell: nacidos is a participle, nocivos is an adjective, so they fill different roles in a sentence.

Which to use

“nacidos” is a participle and “nocivos” is an adjective - they look or sound alike but fill different roles in a sentence.

#6,801
“nacidos” frequency rank
#27,324
“nocivos” frequency rank
34125
confusion score

Side-by-Side Comparison

Feature nacidos nocivos
Definition Forma del plural de nacido, participio de nacer. Forma del plural de nocivo.

Where the eye mixes nacidos and nocivos

Muted = shared; highlighted = the visual trap. They share 5 letters in sequence. nacidos and nocivos follow the identical consonant-vowel pattern (CVCVCVC). Same shape at a glance is often the real trap, independent of shared letters.

7 ch
nacidos
7 ch
nocivos

Why the eye confuses nacidos with nocivos

These two trip readers on the page rather than in the ear: nacidos is [naˈsið̞os] while nocivos is [noˈsiβ̞os]. 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 (participle vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 34125, derived from the frequency rank of both members and their visual similarity.

nacidos is recorded at frequency rank #6,801, classified as aparticiple, pronounced [naˈsið̞os]. nocivos is at rank #27,324, tagged as anadj, pronounced [noˈsiβ̞os].

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 34125, this pair ranks #193,131 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of nacidos vs nocivos

Shared letters: cinos. Private to "nacidos": ad. Private to "nocivos": v.

"nacidos" · 7 letters · shape CVCVCVC  ·  "nocivos" · 7 letters · shape CVCVCVC

Known mistypes of this pair

  • nacidos ← ancidos · naccidos · nacdios · naciddos · nacidoss · nacidso · naciods · naicdos
  • nocivos ← ncoivos · nnocivos · noccivos · nocibos · nociovs · nocivoss · nocivso · nocivvos

Frequently Asked Questions

Can "nacidos" and "nocivos" be used interchangeably?
No - they are not even the same part of speech. "nacidos" is a participle and "nocivos" an adjective, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "nacidos" or "nocivos"?
"nacidos" is the more common of the two: it sits at frequency rank #6,801 in our Spanish list, against #27,324 for "nocivos". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

  • Full dictionary entry for "nacidos" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "nocivos" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #193,131 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "nacidos" and "nocivos" also get mixed up with nearby pairs, the highest-scored neighbour is "nociva vs nocivos". 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 #193,131 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list