pHvspoWhich spelling fits?

Quick tell: pH is a noun, po is an intj, so they fill different roles in a sentence.

Which to use

“pH” is a noun and “po” is an intj - they look or sound alike but fill different roles in a sentence.

#11,648
“pH” frequency rank
#5,029
“po” frequency rank
16677
confusion score

Side-by-Side Comparison

Feature pH po
Definition Cuantificador de acidez o de basicidad (alcalinidad) de soluciones químicas, referido a iones de hidronio (H₃O)⁺. Consta de una escala de cero a catorce donde el valor siete es neutro, cifras inferiores corresponden a substancias ácidas, y las superiores, a básicas (alcalinas). Denota impaciencia, frustración, alegría y otros sentimientos según la entonación que se le dé..

Where the eye mixes pH and po

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

2 ch
pH
2 ch
po

Visual trap between pH and po

These two trip readers on the page rather than in the ear: pH is [ˈf] while po is [ˈpo]. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - h in “pH” becomes o in “po”, and the parts of speech differ too (noun vs intj), which is usually the fastest check. Our composite confusion score for this pair is 16677, derived from the frequency rank of both members and their visual similarity.

pH is recorded at frequency rank #11,648, classified as anoun, pronounced [ˈf]. po is at rank #5,029, tagged as anintj, pronounced [ˈpo].

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 16677, this pair ranks #275,194 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of pH vs po

Shared letters: p. Private to "pH": h. Private to "po": o.

"pH" · 2 letters · shape CC  ·  "po" · 2 letters · shape CV

Frequently Asked Questions

Is swapping "pH" for "po" ever safe?
No - they are not even the same part of speech. "pH" is a noun and "po" an intj, so a sentence built for one is usually ungrammatical with the other.
In ordinary Spanish text, does "pH" or "po" show up more?
"po" is the more common of the two: it sits at frequency rank #5,029 in our Spanish list, against #11,648 for "pH". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

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

  • Full dictionary entry for "pH" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "po" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #275,194 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "pH" and "po" also get mixed up with nearby pairs, the highest-scored neighbour is "pH vs PRC". Nearby pair

Confusion rank #275,194 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