K9
/ˈkeɪnaɪn/
"k9" is a 1-letter English headword indexed on PlainSpell.
The verdict
“K9” sits in 20 confusable pairs (corpus #36,625) as a noun. The look-alike neighbours are the real trap.
- #36,625
- frequency rank, English
- 9,255
- “K” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A trained police dog.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | K9 |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈkeɪnaɪn/ |
| Letters | 2 |
| Frequency rank | #36,625 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “K9” sits in English frequency
Easy to mix with look-alikes
The spelling risk for K9 is neighbouring look-alikes ("kI", "ka", …), not just typos; it is anoun pronounced /ˈkeɪnaɪn/. Frequency #36,625 among 9,255 “K” headwords. Gloss: "A trained police dog.".
K9 has no tracked misspelling variants, which points to an orthography that plays by predictable English rules. It also participates in 20 confusable-pair relationships, "kI", "ka", "ky", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
Etymologically, the entry records: Pseudo-acronym of canine, by phonetic similarity of the letter and number names with the two syllables of canine. The correct English form is K9, spelled K-9.
Definition
- 1A trained police dog.
Etymology
Pseudo-acronym of canine, by phonetic similarity of the letter and number names with the two syllables of canine.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “K9”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is K-9 - every other letter order is a misspelling in standard orthography.
- Say it as /ˈkeɪnaɪn/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “kI” - see the side-by-side comparison. K9 vs kI
- Browse more English words and confusable pairs in the same reference. English words
Words at a similar English frequency
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.