fallacy
/ˈfæl.ə.si/
"fallacy" is a 7-letter English headword indexed on PlainSpell.
The verdict
“fallacy” is a moderately-common English word, ranked #22,081 in English word frequency and used as a noun.
- #22,081
- frequency rank, English
- 7
- letters
- 9
- tracked misspellings
- 1
- confusable pair
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Deceptive or false appearance; that which misleads the eye or the mind.
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 | fallacy |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈfæl.ə.si/ |
| Letters | 7 |
| Frequency rank | #22,081 |
| Misspellings tracked | 9 |
| Confusable pairs | 1 |
| Source | Wiktionary (kaikki.org) |
Where “fallacy” sits in English frequency
Spelling & Dictionary Insight
The English entry for fallacy is 7 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˈfæl.ə.si/. Corpus data places it at rank #22,081 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 9 likely wrong-spelling variants for fallacy, with forms such as "afllacy", "falacy", and "falalcy". 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. It also participates in 1 confusable-pair relationship, "fallback", where similar look or sound leads writers to substitute one word for another in context.
Etymologically, the entry records: From Middle English fallaci, fallace, fallas, from Old French fallace, from Latin fallācia (“deception, deceit”), from fallāx (“deceptive, deceitful”), from fallere (“to deceive”). The correct English form is fallacy, spelled F-A-L-L-A-C-Y.
Definition
- 1Deceptive or false appearance; that which misleads the eye or the mind.
- 2An argument, or apparent argument, which professes to be decisive of the matter at issue, while in reality it is not; a specious argument.
Etymology
From Middle English fallaci, fallace, fallas, from Old French fallace, from Latin fallācia (“deception, deceit”), from fallāx (“deceptive, deceitful”), from fallere (“to deceive”).
This word in other languages
Common misspellings
Also misspelled as: afllacy,falacy,falalcy,fallaccy,fallacyy,fallayc,fallcay,ffallacy,flalacy
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of fallacy - 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 “fallacy”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is F-A-L-L-A-C-Y - every other letter order is a misspelling in standard orthography.
- Say it as /ˈfæl.ə.si/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “fallback” - see the side-by-side comparison. fallacy vs fallback
- 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.