cool

/kuːl/

//kuːl// adj

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

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

The verdict

“cool” sits in 20 confusable pairs (corpus #731) as an adjective. The look-alike neighbours are the real trap.

#731
frequency rank, English
5,599
“C” headwords
3
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Of a mildly low temperature.

Corpus desk

Index EN-cool · cool · English

cool · rank #731 · 3 variants · 20 confusables

  • FREQ-CORE #731
  • LEN-MID 4 letters
  • VOW-2 2 vowels
  • CONFUS-HIGH 20 pairs
  • VAR-LOW 3 variants
  • BOOK-DENSE 5,599
  • PHOTO-FINISH books

Nearest frequency peer: books (-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.

Frequency neighbourhood for “cool”

Lower corpus rank = more everyday usage (inverted bar length for readability)

corpus weight

What this shows Bars show where “cool” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.

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).

cool vs cop
50% similar
cool vs cow
50% similar
cool vs cos
50% similar

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

Key facts for cool
PropertyValue
Headwordcool
LanguageEnglish
Part of speechAdjective
IPA/kuːl/
Letters4
Frequency rank#731
Misspellings tracked3
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “cool” 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). cool lands here:

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

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

Easy to mix with look-alikes

The spelling risk for cool is neighbouring look-alikes ("cop", "cow", …), not just typos; it is anadjective pronounced /kuːl/. Frequency #731 among 5,599 “C” headwords. 13 recorded senses keep meaning in play.

Our generated misspelling index lists 3 likely wrong-spelling variants for cool, with forms such as "ccool", "cooll", and "ocol". 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, "cop", "cow", "cos", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: From Middle English cool, from Old English cōl (“cool, cold, tranquil, calm”), from Proto-West Germanic *kōl(ī), from Proto-Germanic *kōlaz, *kōluz (“cool”), from *kalaną (“to be cold, to freeze”), Proto-Indo-European *gel- (“to be cold, to freeze”). Cognat… The correct English form is cool, spelled C-O-O-L.

Definition

  1. 1
    Of a mildly low temperature.
  2. 2
    Allowing or suggesting heat relief.
  3. 3
    Of a color, in the range of violet to green.
  4. 4
    Not showing emotion; calm and in control of oneself.
  5. 5
    Unenthusiastic; lukewarm; skeptical.
  6. 6
    Calmly audacious.
  7. 7
    Applied facetiously to a sum of money, commonly as if to give emphasis to the largeness of the amount.
  8. 8
    Knowing what to do and how to behave; behaving with effortless and enviable style and panache; considered popular by others.
  9. 9
    Fashionable; trendy; hip.
  10. 10
    All right; acceptable; good.
  11. 11
    Very interesting or exciting.
  12. 12
    Followed by with: able to tolerate.
  13. 13
    Of a pair of people, Having good relations.

Recorded use

Wiktionary examples

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

  1. I like cool weather the most 'cause it's not too hot to wear a jacket but I won't be too cold in my shorts.
  2. The day was cool and snappy for August, and the Rise all green with a lavish nature. Now we plunged into a deep shade with the boughs lacing each other overhead, and crossed dainty, rustic bridges over the cold trout-streams, the boards giving back the clatter of our horses' feet:[…].

Etymology

From Middle English cool, from Old English cōl (“cool, cold, tranquil, calm”), from Proto-West Germanic *kōl(ī), from Proto-Germanic *kōlaz, *kōluz (“cool”), from *kalaną (“to be cold, to freeze”), Proto-Indo-European *gel- (“to be cold, to freeze”). Cognates Cognate with North Frisian kuul, kölj (“cold”), Saterland Frisian köil (“cool”), West Frisian koel (“cool”), Cimbrian khuul (“chilly, cool”), Dutch koel (“cool”), German kühl (“cool”), Low German köhl (“cool”), Luxembourgish kill (“cool”), Vilamovian kił (“cool”); also Latin gelū, gelum, gelus (“frost; chill, cold”), Belarusian хо́лад (xólad, “cold”), Bulgarian хлад (hlad, “chill, coolness”), Czech chlad (“cold”), Macedonian лад (lad, “shade; coolness”), Polish chłód (“cold”), Russian and Ukrainian хо́лод (xólod, “cold”), Serbo-Croatian хла̑д, hlȃd (“shade”), Sanskrit जड (jaḍa, “cold; stiff”), जल (jala, “water”). Related to cold.

This word in other languages

fresco(Español)frais(Français)kühl(Deutsch)fresco(Português)

Common misspellings

Also misspelled as:

  • ccool
  • cooll
  • ocol

Misspelling Pattern Breakdown

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

ccool1cooll1ocol2
Edit distance from "cool"

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.

PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of September 3, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.

Frequently Asked Questions

How do you spell "cool"?
"cool" is spelled C-O-O-L. The IPA pronunciation is /kuːl/.
What does "cool" mean?
As an adjective, "cool" means: Of a mildly low temperature.
What words are commonly confused with "cool"?
"cool" is commonly confused with "cop", "cow", "cos". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "cool"?
The IPA (International Phonetic Alphabet) transcription for "cool" is /kuːl/. 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 "cool"?
From Middle English cool, from Old English cōl (“cool, cold, tranquil, calm”), from Proto-West Germanic *kōl(ī), from Proto-Germanic *kōlaz, *kōluz (“cool”), from *kalaną (“to be cold, to freeze”), Proto-Indo-European *gel- (“to be cold, to freeze... 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 "cool", not the corpus desk frequency band.

Same letter count

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

bill#729sent#722park#717rate#752

What to do next

You've looked up "cool". Here's where to go from here.

  • "cool" maps to 20 confusable pairs in this vintage; the highest-scored is "cop". View pair
  • 3 edit-distance misspelling variants are generated for spell-check research on this headword. See variants
  • Usage frequency rank #731 among English headwords in this corpus. Corpus statistics
  • Browse more English words in the "C" letter cohort. C–Z browse
  • PlainSpell rotates a curated Word of the Day from the English corpus, a passive way to discover vocabulary. Word of the Day

PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.

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