fireproof

adj

By · According to Wiktionary data (CC BY-SA) ·

"fireproof" is a 9-letter English headword indexed on PlainSpell.

The verdict

“fireproof” has 13 generated spelling variants in the English index at frequency #37,930. The variants make it a useful spelling check.

#37,930
frequency rank, English
2,507
“F” headwords
13
tracked misspellings

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Resistant to damage from fire.

Corpus desk

Index EN-fireproof · fireproof · English

fireproof · rank #37,930 · 13 variants · 0 confusables

  • FREQ-MID #37,930
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-HIGH 13 variants
  • BOOK-MID 2,507
  • PHOTO-FINISH feudalism

Nearest frequency peer: feudalism (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “fireproof”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “fireproof” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for fireproof
PropertyValue
Headwordfireproof
LanguageEnglish
Part of speechAdjective
Letters9
Frequency rank#37,930
Misspellings tracked13
Confusable pairs0
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “fireproof”

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).fireprooflands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “feudalism” (#37,929), “flounder” (#37,931), “fervently” (#37,928). Among 2,507 “F” headwords, “fireproof” is #37,930. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 13 spelling variants around fireproof, anadjective. Corpus frequency is #37,930 among 2,507 “F” headwords. Dominant gloss: "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

  1. 1
    Resistant to damage from fire.

Recorded use

Wiktionary example

These source excerpts show how fireproof appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. The fireproof safe will protect documents inside for up to four hours in a standard house fire.

Etymology

From fire + -proof.

This word in other languages

ignífugo(Español)ignifuge(Français)feuerfest(Deutsch)

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.

ffireproof1fierproof2fireporof2firepproof1fireprof1fireprofo2fireprooff1fireprroof1
Edit distance from "fireproof"

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

How do you spell "fireproof"?
"fireproof" is spelled F-I-R-E-P-R-O-O-F.
What does "fireproof" mean?
As an adjective, "fireproof" means: Resistant to damage from fire.
What are common misspellings of "fireproof"?
Common misspellings include "ffireproof", "fierproof", "fireporof", "firepproof", "fireprof". The correct spelling is "fireproof".
What is the origin of the word "fireproof"?
From fire + -proof. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "fireproof", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 9 letters (nearest by frequency rank).

feudalism#37,929fervently#37,928gleefully#37,943esplanade#37,916

Similar misspelling depth

Headwords with a similar count of attested misspellings (13 here; floor ≥5).

glycogen13 variantsDominguez13 variantsHendrick13 variantscollarbone13 variants

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

Source: FrequencyWords open word-frequency list