fusion

/ˈfjuː.ʒən/

//ˈfjuː.ʒən// noun

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

"fusion" is a 6-letter English headword indexed on PlainSpell.

The verdict

“fusion” has 9 generated spelling variants in the English index at frequency #6,911. The variants make it a useful spelling check.

#6,911
frequency rank, English
2,507
“F” headwords
9
tracked misspellings
6
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The act of merging separate things, or the result thereof.

Corpus desk

Index EN-fusion · fusion · English

fusion · rank #6,911 · 9 variants · 6 confusables

  • FREQ-COMMON #6,911
  • LEN-LONG 6 letters
  • VOW-3 3 vowels
  • CONFUS-MID 6 pairs
  • VAR-MID 9 variants
  • BOOK-MID 2,507
  • PHOTO-FINISH functioning

Nearest frequency peer: functioning (-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 “fusion”

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

corpus weight

What this shows “fusion” 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

Visual similarity to commonly confused words

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

fusion vs futon
67% similar
fusion vs Fulton
50% similar
fusion vs fusing
67% similar

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

Key facts for fusion
PropertyValue
Headwordfusion
LanguageEnglish
Part of speechNoun
IPA/ˈfjuː.ʒən/
Letters6
Frequency rank#6,911
Misspellings tracked9
Confusable pairs6
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “fusion”

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

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

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Same rarity band neighbours include “functioning” (#6,910), “gauge” (#6,912), “fridge” (#6,909). Among 2,507 “F” headwords, “fusion” is #6,911. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 9 spelling variants around fusion (IPA /ˈfjuː.ʒən/), anoun. Corpus frequency is #6,911 among 2,507 “F” headwords. Wiktionary lists 8 senses, so context still picks the gloss.

Our generated misspelling index lists 9 likely wrong-spelling variants for fusion, with forms such as "ffusion", "fsuion", and "fuison". 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 6 confusable-pair relationships, "futon", "Fulton", "fusing", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: First appears c. 1555, in a translation by Richard Eden. From Middle French fusion, from Latin fūsiōnem (the accusative of fūsiō), from fusus, past participle of fundō (“I pour, I melt”) (see also found). Doublet of foison. The correct English form is fusion, spelled F-U-S-I-O-N.

Definition

  1. 1
    The act of merging separate things, or the result thereof.
  2. 2
    The act of merging separate things, or the result thereof.
  3. 3
    The act of merging separate things, or the result thereof.
  4. 4
    The act of merging separate things, or the result thereof.
  5. 5
    The act of merging separate things, or the result thereof.
  6. 6
    The act of merging separate things, or the result thereof.
  7. 7
    The act of merging separate things, or the result thereof.
  8. 8
    The act of merging separate things, or the result thereof.

Recorded use

Wiktionary examples

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

  1. These tasks may be summarised as comprising the maintenance and improvement of railway services and facilities during a transitional period; the reorganising of systems of management and technical practices, so as to secure maximum efficiency and economy from the fusion of four major railway systems (using for these purposes all the resources and traditio…
  2. This Cryſtal is a pellucid fiſſile Stone, clear as Water or Cryſtal of the Rock, and without Colour; enduring a red Heat without loſing its tranſparency, and in a very ſtrong Heat calcining without Fuſion.

Etymology

First appears c. 1555, in a translation by Richard Eden. From Middle French fusion, from Latin fūsiōnem (the accusative of fūsiō), from fusus, past participle of fundō (“I pour, I melt”) (see also found). Doublet of foison.

Antonyms

fission

This word in other languages

derretimiento(Español)fusion(Français)Schmelzen(Deutsch)fusão(Português)

Common misspellings

Also misspelled as:

  • ffusion
  • fsuion
  • fuison
  • fusino
  • fusionn
  • fusoin
  • fussion
  • fution
  • ufsion

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of fusion - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

ffusion1fsuion2fuison2fusino2fusionn1fusoin2fussion1fution1
Edit distance from "fusion"

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 "fusion"?
"fusion" is spelled F-U-S-I-O-N. The IPA pronunciation is /ˈfjuː.ʒən/.
What does "fusion" mean?
As a noun, "fusion" means: The act of merging separate things, or the result thereof.
What words are commonly confused with "fusion"?
"fusion" is commonly confused with "futon", "Fulton", "fusing". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "fusion"?
The IPA (International Phonetic Alphabet) transcription for "fusion" is /ˈfjuː.ʒən/. 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 "fusion"?
First appears c. 1555, in a translation by Richard Eden. From Middle French fusion, from Latin fūsiōnem (the accusative of fūsiō), from fusus, past participle of fundō (“I pour, I melt”) (see also found). Doublet of foison. 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 "fusion", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 6 letters (nearest by frequency rank).

fridge#6,909fisher#6,905helmet#6,917idiots#6,920

Similar misspelling depth

Headwords with a similar count of attested misspellings (9 here; floor ≥5).

innings9 variantsDuncan9 variantsdiving9 variantsnamely9 variants

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

Source: FrequencyWords open word-frequency list