flex

/flɛks/

//flɛks// noun

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

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

The verdict

“flex” has 6 generated spelling variants in the English index at frequency #10,696. The variants make it a useful spelling check.

#10,696
frequency rank, English
2,507
“F” headwords
6
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Flexibility, pliancy.

Corpus desk

Index EN-flex · flex · English

flex · rank #10,696 · 6 variants · 20 confusables

  • FREQ-MID #10,696
  • LEN-MID 4 letters
  • VOW-1 1 vowel
  • CONFUS-HIGH 20 pairs
  • VAR-MID 6 variants
  • BOOK-MID 2,507
  • PHOTO-FINISH flavour

Nearest frequency peer: flavour (-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 “flex”

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

corpus weight

What this shows “flex” 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).

flex vs fly
50% similar
flex vs fox
50% similar
flex vs flu
50% similar

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

Key facts for flex
PropertyValue
Headwordflex
LanguageEnglish
Part of speechNoun
IPA/flɛks/
Letters4
Frequency rank#10,696
Misspellings tracked6
Confusable pairs20
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “flex”

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).flexlands here:

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

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “flavour” (#10,695), “firstly” (#10,694), “faded” (#10,693). Among 2,507 “F” headwords, “flex” is #10,696. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 6 spelling variants around flex (IPA /flɛks/), anoun. Corpus frequency is #10,696 among 2,507 “F” headwords. Wiktionary lists 7 senses, so context still picks the gloss.

Our generated misspelling index lists 6 likely wrong-spelling variants for flex, with forms such as "felx", "fflex", and "flexx". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 20 confusable-pair relationships, "fly", "fox", "flu", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From Latin flexus, past participle of flecto (“to bend”). The correct English form is flex, spelled F-L-E-X.

Definition

  1. 1
    Flexibility, pliancy.
  2. 2
    An act of flexing.
  3. 3
    Any flexible insulated electrical wiring.
  4. 4
    A flexible insulated electrical cord.
  5. 5
    Flexible ductwork, typically flexible plastic over a metal wire coil to shape a tube.
  6. 6
    A point of inflection.
  7. 7
    An act or instance of flaunting something; a boast or brag; something considered impressive.

Recorded use

Wiktionary examples

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

  1. The hills become more rounded. The slopes are either the stooped shoulders of an aging colossus or the muscular flexes of a geologic youngster, but they are pleasant, comforting. This landscape is what most would think of […]
  2. The books lent her by Dr Grimble on period furniture and ceramics interested her deeply, and she studied them at night in the silence of the shop, where she had a flex and a reading lamp installed at her own expense.

Etymology

From Latin flexus, past participle of flecto (“to bend”).

This word in other languages

Flexibilität(Deutsch)flexão(Português)

Common misspellings

Also misspelled as:

  • felx
  • fflex
  • flexx
  • fllex
  • flxe
  • lfex

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of flex - 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.

felx2fflex1flexx1fllex1flxe2lfex2
Edit distance from "flex"

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 "flex"?
"flex" is spelled F-L-E-X. The IPA pronunciation is /flɛks/.
What does "flex" mean?
As a noun, "flex" means: Flexibility, pliancy.
What words are commonly confused with "flex"?
"flex" is commonly confused with "fly", "fox", "flu". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "flex"?
The IPA (International Phonetic Alphabet) transcription for "flex" is /flɛks/. 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 "flex"?
From Latin flexus, past participle of flecto (“to bend”). 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 "flex", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 4 letters (nearest by frequency rank).

Emmy#10,684Hank#10,709hose#10,710lava#10,720

Similar misspelling depth

Headwords with a similar count of attested misspellings (6 here; floor ≥5).

faded6 variantschili6 variantsowing6 variantspact6 variants

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

Source: FrequencyWords open word-frequency list