fireproof
"fireproof" is a 9-letter English headword indexed on PlainSpell.
The verdict
“fireproof” is a moderately-common English word, ranked #37,930 in English word frequency and used as an adjective.
- #37,930
- frequency rank, English
- 9
- letters
- 13
- tracked misspellings
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Resistant to damage from fire.
| Property | Value |
|---|---|
| Headword | fireproof |
| Language | English |
| Part of speech | Adjective |
| Letters | 9 |
| Frequency rank | #37,930 |
| Misspellings tracked | 13 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “fireproof” sits in English frequency
Spelling & Dictionary Insight
The English entry for fireproof is 9 letters long, classified as an adjective. Corpus data places it at rank #37,930 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. The dominant gloss from Wiktionary reads: "Resistant to damage from fire.".
Our generated misspelling index lists 13 likely wrong-spelling variants for fireproof, with forms such as "ffireproof", "fierproof", and "fireporof". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. Our confusable-pair dataset has no match for it, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.
Etymologically, the entry records: From fire + -proof. The correct English form is fireproof, spelled F-I-R-E-P-R-O-O-F.
Definition
- 1Resistant to damage from fire.
Etymology
From fire + -proof.
This word in other languages
Common misspellings
Also misspelled as: ffireproof,fierproof,fireporof,firepproof,fireprof,fireprofo,fireprooff,fireprroof,firerpoof,firperoof,firreproof,frieproof,ifreproof
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of fireproof - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.
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 “fireproof”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is F-I-R-E-P-R-O-O-F - 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.