post office box
"post-office-box" is a 13-letter English headword indexed on PlainSpell.
The verdict
“post office box” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 15
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A uniquely addressable lockable box located on the premises of a post office that may be hired as collection point for mail.
| Property | Value |
|---|---|
| Headword | post office box |
| Language | English |
| Part of speech | Noun |
| Letters | 15 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “post office box” sits in English frequency
Rare enough to double-check
post office box is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. 2 senses are on record.
Zero misspellings are on record for post office box in our index, and the word's spelling is regular enough that our generator found nothing worth flagging. Our dataset records no confusable match here, since its spelling is unusual enough that it doesn't cluster with a lookalike.
No documented word history exists for this headword, so spelling patterns must be inferred from the word's phoneme-to-grapheme mapping rather than from a documented borrowing chain. The correct English form is post office box, spelled P-O-S-T- -O-F-F-I-C-E- -B-O-X.
Definition
- 1A uniquely addressable lockable box located on the premises of a post office that may be hired as collection point for mail.
- 2A test instrument once used by telephone engineers.
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “post office box”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is P-O-S-T- -O-F-F-I-C-E- -B-O-X - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.