ponvsproWhich spelling fits?

Which to use

“pon” and “pro” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#36,713
“pon” frequency rank
#1,232
“pro” frequency rank
37945
confusion score

Side-by-Side Comparison

Feature pon pro
Definition A call for forming a set of three identical tiles using a discarded tile. An advantage of something, especially when contrasted with its disadvantages (cons).

Where the eye mixes pon and pro

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

3 ch
pon
3 ch
pro

Visual trap between pon and pro

A purely visual mix-up. pon (/pɒn/) and pro (/pɹəʊ/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 37945, derived from the frequency rank of both members and their visual similarity.

pon is recorded at frequency rank #36,713, classified as anoun, pronounced /pɒn/. pro is at rank #1,232, tagged as anoun, pronounced /pɹəʊ/.

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 37945, this pair ranks #290,150 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of pon vs pro

Shared letters: op. Private to "pon": n. Private to "pro": r.

"pon" · 3 letters · shape CVC  ·  "pro" · 3 letters · shape CCV

Frequently Asked Questions

Is swapping "pon" for "pro" ever safe?
No. They are said differently (/pɒn/ versus /pɹəʊ/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
In ordinary English text, does "pon" or "pro" show up more?
"pro" is the more common of the two: it sits at frequency rank #1,232 in our English list, against #36,713 for "pon". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

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 "pon" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "pro" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #290,150 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
  • "pon" and "pro" also get mixed up with nearby pairs, the highest-scored neighbour is "pon vs PPA". Nearby pair

Confusion rank #290,150 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list