sleeper

/ˈsliːpə(ɹ)/

//ˈsliːpə(ɹ)// noun

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

"sleeper" is a 7-letter English headword indexed on PlainSpell.

The verdict

“sleeper” has 10 generated spelling variants in the English index at frequency #15,911. The variants make it a useful spelling check.

#15,911
frequency rank, English
6,566
“S” headwords
10
tracked misspellings
12
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Someone who sleeps.

Corpus desk

Index EN-sleeper · sleeper · English

sleeper · rank #15,911 · 10 variants · 12 confusables

  • FREQ-MID #15,911
  • LEN-LONG 7 letters
  • VOW-3 3 vowels
  • CONFUS-MID 12 pairs
  • VAR-MID 10 variants
  • BOOK-DENSE 6,566
  • PHOTO-FINISH slater

Nearest frequency peer: slater (-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 “sleeper”

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

corpus weight

What this shows “sleeper” 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).

sleeper vs sleeve
71% similar
sleeper vs sleeps
71% similar
sleeper vs sleepy
71% similar

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

Key facts for sleeper
PropertyValue
Headwordsleeper
LanguageEnglish
Part of speechNoun
IPA/ˈsliːpə(ɹ)/
Letters7
Frequency rank#15,911
Misspellings tracked10
Confusable pairs12
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “sleeper”

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).sleeperlands 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 “slater” (#15,910), “smear” (#15,912), “siren” (#15,909). Among 6,566 “S” headwords, “sleeper” is #15,911. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 10 spelling variants around sleeper (IPA /ˈsliːpə(ɹ)/), anoun. Corpus frequency is #15,911 among 6,566 “S” headwords. Wiktionary lists 14 senses, so context still picks the gloss.

Our generated misspelling index lists 10 likely wrong-spelling variants for sleeper, with forms such as "lseeper", "seleper", and "sleeepr". 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 12 confusable-pair relationships, "sleeve", "sleeps", "sleepy", 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 Middle English sleper, equivalent to sleep + -er. The correct English form is sleeper, spelled S-L-E-E-P-E-R.

Definition

  1. 1
    Someone who sleeps.
  2. 2
    That which lies dormant, as a law.
  3. 3
    A spy, saboteur, or terrorist who lives unobtrusively in a community until activated by a prearranged signal; may be part of a sleeper cell.
  4. 4
    A small starter earring, worn to prevent a piercing from closing.
  5. 5
    A railway sleeping car.
  6. 6
    A sleeper hold.
  7. 7
    Something that achieves unexpected success after an interval of time.
  8. 8
    Any of family Odontobutidae of goby-like bottom-feeding freshwater fish.
  9. 9
    A nurse shark (family Ginglymostomatidae).
  10. 10
    A type of pajama for a person, especially a child, that covers the whole body, including the feet.
  11. 11
    An automobile which has been internally modified to excess, while retaining a mostly stock appearance in order to fool opponents in a drag race, or to avoid the attention of the police.
  12. 12
    A sedative.
  13. 13
    A bet placed on the gambling table and then forgotten about by the gambler.
  14. 14
    A pod or similar device containing a person in cryosleep.

Recorded use

Wiktionary examples

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

  1. I'm a light sleeper: I get woken up by the smallest of sounds.
  2. She's a heavy sleeper: it takes a lot to wake her up.

Etymology

From Middle English sleper, equivalent to sleep + -er.

Synonyms

sleeper goby

This word in other languages

dormilón(Español)dormeur(Français)Schläfer(Deutsch)

Common misspellings

Also misspelled as:

  • lseeper
  • seleper
  • sleeepr
  • sleeperr
  • sleepper
  • sleepre
  • slepeer
  • sleper
  • slleeper
  • ssleeper

Misspelling Pattern Breakdown

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

lseeper2seleper2sleeepr2sleeperr1sleepper1sleepre2slepeer2sleper1
Edit distance from "sleeper"

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 "sleeper"?
"sleeper" is spelled S-L-E-E-P-E-R. The IPA pronunciation is /ˈsliːpə(ɹ)/.
What does "sleeper" mean?
As a noun, "sleeper" means: Someone who sleeps.
What words are commonly confused with "sleeper"?
"sleeper" is commonly confused with "sleeve", "sleeps", "sleepy". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "sleeper"?
The IPA (International Phonetic Alphabet) transcription for "sleeper" is /ˈsliːpə(ɹ)/. 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 "sleeper"?
From Middle English sleper, equivalent to sleep + -er. 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 "sleeper", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 7 letters (nearest by frequency rank).

serpent#15,902Rihanna#15,898suffice#15,925rejoice#15,894

Similar misspelling depth

Headwords with a similar count of attested misspellings (10 here; floor ≥5).

stormy10 variantsplight10 variantspierced10 variantsabiding10 variants

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

Source: FrequencyWords open word-frequency list