fuel

/ˈfjuːəl/

//ˈfjuːəl// noun

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

"fuel" is a 4-letter English headword indexed on PlainSpell.

The verdict

“fuel” is a regularly-used English word, ranked #1,942 in English word frequency and used as a noun.

#1,942
frequency rank, English
4
letters
5
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Substance consumed to provide energy through combustion, or through chemical or nuclear reaction.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

fuel vs fun
50% similar
fuel vs fur
50% similar
fuel vs fut
50% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for fuel
PropertyValue
Headwordfuel
LanguageEnglish
Part of speechNoun
IPA/ˈfjuːəl/
Letters4
Frequency rank#1,942
Misspellings tracked5
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “fuel” sits in English frequency

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

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

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for fuel is 4 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˈfjuːəl/. Corpus data places it at rank #1,942 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 3 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 5 likely wrong-spelling variants for fuel, with forms such as "feul", "ffuel", and "fuell". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 20 confusable-pair relationships, "fun", "fur", "fut", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Middle English fuayle, from Old French fouaille, feuaille (“firewood, kindling”), from feu (“fire”), from Late Latin focus (“fire”), from Latin focus (“hearth”), whence English focus. Cognate with Spanish fuego (“fire”), and Portuguese fogo (“fire”). The correct English form is fuel, spelled F-U-E-L.

Definition

  1. 1
    Substance consumed to provide energy through combustion, or through chemical or nuclear reaction.
  2. 2
    Substance that provides nourishment for a living organism; food.
  3. 3
    Something that stimulates, encourages or maintains an action.

Etymology

From Middle English fuayle, from Old French fouaille, feuaille (“firewood, kindling”), from feu (“fire”), from Late Latin focus (“fire”), from Latin focus (“hearth”), whence English focus. Cognate with Spanish fuego (“fire”), and Portuguese fogo (“fire”).

This word in other languages

combustible(Español)carburant(Français)Brennstoff(Deutsch)combustível(Português)

Common misspellings

Also misspelled as: feul,ffuel,fuell,fule,ufel

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of fuel - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

feul2ffuel1fuell1fule2ufel2
Edit distance from "fuel"

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 "fuel"?
"fuel" is spelled F-U-E-L. The IPA pronunciation is /ˈfjuːəl/.
What does "fuel" mean?
As a noun, "fuel" means: Substance consumed to provide energy through combustion, or through chemical or nuclear reaction.
What words are commonly confused with "fuel"?
"fuel" is commonly confused with "fun", "fur", "fut". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "fuel"?
The IPA (International Phonetic Alphabet) transcription for "fuel" is /ˈfjuːəl/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "fuel"?
From Middle English fuayle, from Old French fouaille, feuaille (“firewood, kindling”), from feu (“fire”), from Late Latin focus (“fire”), from Latin focus (“hearth”), whence English focus. Cognate with Spanish fuego (“fire”), and Portuguese fogo (... 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.

Using “fuel”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is F-U-E-L - every other letter order is a misspelling in standard orthography.
  • Say it as /ˈfjuːəl/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “fun” - see the side-by-side comparison. fuel vs fun
  • 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.

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

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list