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” is a regularly-used English word, ranked #4,799 in English word frequency and used as a noun.

#4,799
frequency rank, English
3
letters
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 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).

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)

Where “spy” 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). spy 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 spy is 3 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /spaɪ/. Corpus data places it at rank #4,799 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.

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.

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.

Using “spy”

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

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