loon

/ˈluːn/

//ˈluːn// noun

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

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

The verdict

“loon” is a moderately-common English word, ranked #29,351 in English word frequency and used as a noun.

#29,351
frequency rank, English
4
letters
4
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A crazy or deranged person; a lunatic.

Visual similarity to commonly confused words

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

loon vs lot
50% similar
loon vs low
50% similar
loon vs los
50% similar

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

Key facts for loon
PropertyValue
Headwordloon
LanguageEnglish
Part of speechNoun
IPA/ˈluːn/
Letters4
Frequency rank#29,351
Misspellings tracked4
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “loon” 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). loon 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 loon is 4 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˈluːn/. Corpus data places it at rank #29,351 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 8 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 4 likely wrong-spelling variants for loon, with forms such as "lloon", "lono", and "loonn". 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, "lot", "low", "los", 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 louen, lowen (“rascal; rogue”), probably of Middle Dutch or Middle Low German origin. Compare Dutch loen (“simpleton”). Or, related to etymology 2, due to the bird's loud cry. Folk etymology associates it slang-wise with lunatic, though … The correct English form is loon, spelled L-O-O-N.

Definition

  1. 1
    A crazy or deranged person; a lunatic.
  2. 2
    An idler, a lout.
  3. 3
    A boy, a lad.
  4. 4
    A harlot; mistress.
  5. 5
    A simpleton.
  6. 6
    An English soldier of an expeditionary army in Ireland.
  7. 7
    A round area of pavement that protrudes from one side of a road to accommodate turning vehicles with a wide turning circle.
  8. 8
    Clipping of balloon.

Etymology

From Middle English louen, lowen (“rascal; rogue”), probably of Middle Dutch or Middle Low German origin. Compare Dutch loen (“simpleton”). Or, related to etymology 2, due to the bird's loud cry. Folk etymology associates it slang-wise with lunatic, though the latter may have influenced it; see loony.

Synonyms

lunaticpsychowackobulb-out

This word in other languages

lunático(Español)fou(Français)Traumtänzer(Deutsch)louco(Português)

Common misspellings

Also misspelled as: lloon,lono,loonn,olon

Misspelling Pattern Breakdown

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

lloon1lono2loonn1olon2
Edit distance from "loon"

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 "loon"?
"loon" is spelled L-O-O-N. The IPA pronunciation is /ˈluːn/.
What does "loon" mean?
As a noun, "loon" means: A crazy or deranged person; a lunatic.
What words are commonly confused with "loon"?
"loon" is commonly confused with "lot", "low", "los". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "loon"?
The IPA (International Phonetic Alphabet) transcription for "loon" is /ˈluːn/. 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 "loon"?
From Middle English louen, lowen (“rascal; rogue”), probably of Middle Dutch or Middle Low German origin. Compare Dutch loen (“simpleton”). Or, related to etymology 2, due to the bird's loud cry. Folk etymology associates it slang-wise with lunati... 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 “loon”

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

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