packvsPlanckWhich spelling fits?

Quick tell: pack is a noun, Planck is a name, so they fill different roles in a sentence.

Which to use

“pack” is a noun and “Planck” is a name - they look or sound alike but fill different roles in a sentence.

#7,095
“pack” frequency rank
#41,960
“Planck” frequency rank
49055
confusion score

Side-by-Side Comparison

Feature pack Planck
Definition Lot d'une même marchandise présenté sous film de plastique, en emballage de carton etc. Nom de famille.

Where the eye mixes pack and Planck

Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.

4 ch
pack
6 ch
Planck

Visual trap between pack and Planck

These two trip readers on the page rather than in the ear: pack is \pak\ while Planck is \plɑ̃k\. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 letter(s) in length, and the parts of speech differ too (noun vs name), which is usually the fastest check. Our composite confusion score for this pair is 49055, derived from the frequency rank of both members and their visual similarity.

pack is recorded at frequency rank #7,095, classified as anoun, pronounced \pak\. Planck is at rank #41,960, tagged as aname, pronounced \plɑ̃k\.

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 49055, this pair ranks #173,833 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of pack vs Planck

Shared letters: ackp. Private to "pack": -. Private to "Planck": ln.

"pack" · 4 letters · shape CVCC  ·  "Planck" · 6 letters · shape CCVCCC

Known mistypes of this pair

  • packapck · pacck · packk · pakc · pcak · ppack
  • Plancklpanck · palnck · placnk · plancck · planckk · plankc · plannck · pllanck

Frequently Asked Questions

Is swapping "pack" for "Planck" ever safe?
No - they are not even the same part of speech. "pack" is a noun and "Planck" a name, so a sentence built for one is usually ungrammatical with the other.
Frequency check: "pack" vs "Planck" - which ranks higher?
"pack" is the more common of the two: it sits at frequency rank #7,095 in our French list, against #41,960 for "Planck". 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 "pack" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "Planck" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #173,833 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
  • "pack" and "Planck" also get mixed up with nearby pairs, the highest-scored neighbour is "Planck vs planes". 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 #173,833 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list