SOS
/ˌɛs.əʊˈɛs/
"sos" is a 3-letter English headword indexed on PlainSpell.
The verdict
“SOS” is a moderately-common English word, ranked #18,189 in English word frequency and used as a noun.
- #18,189
- frequency rank, English
- 3
- letters
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The conventional Morse code call made by a ship in distress.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | SOS |
| Language | English |
| Part of speech | Noun |
| IPA | /ˌɛs.əʊˈɛs/ |
| Letters | 3 |
| Frequency rank | #18,189 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “SOS” sits in English frequency
Spelling & Dictionary Insight
The English entry for SOS is 3 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˌɛs.əʊˈɛs/. Corpus data places it at rank #18,189 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. The dominant gloss from Wiktionary reads: "The conventional Morse code call made by a ship in distress.".
SOS doesn't appear in our generated misspelling index, which points to an orthography that plays by predictable English rules. It also participates in 20 confusable-pair relationships, "SS", "SP", "su", 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 the letters represented by the signal, chosen as a sequence that is easy to recall and transmit (· · · — — — · · ·); it is not, as is commonly believed, an abbreviation for "save our souls", "save our ship", or any other phrase. The correct English form is SOS, spelled S-O-S.
Definition
- 1The conventional Morse code call made by a ship in distress.
Etymology
From the letters represented by the signal, chosen as a sequence that is easy to recall and transmit (· · · — — — · · ·); it is not, as is commonly believed, an abbreviation for "save our souls", "save our ship", or any other phrase.
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
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Using “SOS”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is S-O-S - every other letter order is a misspelling in standard orthography.
- Say it as /ˌɛs.əʊˈɛs/ (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. SOS 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.