spy

/spaɪ/

//spaɪ// noun

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

"spy" is a 3-letter English headword indexed on PlainSpell.

The verdict

“spy” sits in 20 confusable pairs (corpus #4,799) as a noun. The look-alike neighbours are the real trap.

#4,799
frequency rank, English
6,566
“S” headwords
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A person who secretly watches and examines the actions of other individuals or organizations and gathers information on them (usually to gain an advantage).

Corpus desk

Index EN-spy · spy · English

spy · rank #4,799 · 0 variants · 20 confusables

  • FREQ-COMMON #4,799
  • LEN-MID 3 letters
  • VOW-1 1 vowel
  • CONFUS-HIGH 20 pairs
  • VAR-0 0 variants
  • BOOK-DENSE 6,566
  • PHOTO-FINISH springs

Nearest frequency peer: springs (-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 neighbours of confusable “spy”

Peers at similar corpus weight, separate from look-alike pairs below

corpus weight

What this shows Bars place “spy” against nearest ranked English headwords, not a reprint of the confusable-pair desk.

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).

spy vs SS
0% similar
spy vs su
33% similar
spy vs SW
0% similar

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

Key facts for spy
PropertyValue
Headwordspy
LanguageEnglish
Part of speechNoun
IPA/spaɪ/
Letters3
Frequency rank#4,799
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Corpus rank beside confusables of “spy”

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).spylands 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 “springs” (#4,798), “Steven” (#4,800), “speakers” (#4,797). Among 6,566 “S” headwords, “spy” is #4,799. Source: FrequencyWords open word-frequency list.

Easy to mix with look-alikes

The spelling risk for spy is neighbouring look-alikes ("SS", "su", …), not just typos; it is anoun pronounced /spaɪ/. Frequency #4,799 among 6,566 “S” headwords. 2 recorded senses keep meaning in play.

Zero misspellings are on record for spy in our index, a sign its spelling follows regular English conventions. It also participates in 20 confusable-pair relationships, "SS", "su", "SW", 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 spien, aphetic variant of earlier espien (“to espy”), from Old French espier (“to spy”), from Frankish *spehōn (“to spy”), from Proto-Germanic *spehōną (“to see, look”), from Proto-Indo-European *speḱ- (“to look”). Akin to German spähen … The correct English form is spy, spelled S-P-Y.

Definition

  1. 1
    A person who secretly watches and examines the actions of other individuals or organizations and gathers information on them (usually to gain an advantage).
  2. 2
    A defensive player assigned to cover an offensive backfield player man-to-man when they are expected to engage in a running play, but the offensive player does not run with the ball immediately.

Recorded use

Wiktionary examples

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

  1. The dead leap at the throat, destroy The meaning of the day; dark forms Have scaled your walls, and spies betray Old secrets to amorphous swarms.
  2. Even without hovering drones, a lurking assassin, a thumping score and a denouement, the real-life story of Edward Snowden, a rogue spy on the run, could be straight out of the cinema. But, as with Hollywood, the subplots and exotic locations may distract from the real message: America’s discomfort and its foes’ glee.

Etymology

From Middle English spien, aphetic variant of earlier espien (“to espy”), from Old French espier (“to spy”), from Frankish *spehōn (“to spy”), from Proto-Germanic *spehōną (“to see, look”), from Proto-Indo-European *speḱ- (“to look”). Akin to German spähen (“to spy”), Dutch spieden (“to spy”). The noun displaced native Old English sċēawere (literally “watcher”), which was also the word for "mirror." In this sense, the verb displaced Old English sċēawian, which was also the word for "to watch" and became the Modern English word show. Distant cognate vie PIE with Latin speculātor, Ancient Greek κατάσκοπος (katáskopos). Compare typologically Russian согляда́тай (sogljadátaj) (akin to гляде́ть (gljadétʹ)).

Synonyms

espialespyghostintelligencersecret agentspookspyundie

This word in other languages

espía(Español)espion(Français)Spion(Deutsch)espião(Português)

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 "spy"?
"spy" is spelled S-P-Y. The IPA pronunciation is /spaɪ/.
What does "spy" mean?
As a noun, "spy" means: A person who secretly watches and examines the actions of other individuals or organizations and gathers information on them (usually to gain an advantage).
What words are commonly confused with "spy"?
"spy" is commonly confused with "SS", "su", "SW". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "spy"?
The IPA (International Phonetic Alphabet) transcription for "spy" is /spaɪ/. 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 "spy"?
From Middle English spien, aphetic variant of earlier espien (“to espy”), from Old French espier (“to spy”), from Frankish *spehōn (“to spy”), from Proto-Germanic *spehōną (“to see, look”), from Proto-Indo-European *speḱ- (“to look”). Akin to Germ... 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 "spy", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 3 letters (nearest by frequency rank).

pat#4,785ABC#4,7328th#4,731leo#4,870

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

Source: FrequencyWords open word-frequency list