macOS

/ˌmækoʊˈɛs/

//ˌmækoʊˈɛs// name

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

"macos" is a 5-letter English headword indexed on PlainSpell.

The verdict

“macOS” has 7 generated spelling variants in the English index at frequency #28,283. The variants make it a useful spelling check.

#28,283
frequency rank, English
4,057
“M” headwords
7
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A major operating system, formerly known as OS X (and before that as Mac OS X), used on laptop and desktop computers by Apple Inc.

Corpus desk

Index EN-macos · macOS · English

macOS · rank #28,283 · 7 variants · 20 confusables

  • FREQ-MID #28,283
  • LEN-MID 5 letters
  • VOW-2 2 vowels
  • CONFUS-HIGH 20 pairs
  • VAR-MID 7 variants
  • BOOK-MID 4,057
  • PHOTO-FINISH longs

Nearest frequency peer: longs (-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 “macOS”

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

corpus weight

What this shows “macOS” 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).

macOS vs mao
40% similar
macOS vs MoS
20% similar
macOS vs MCS
20% similar

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

Key facts for macOS
PropertyValue
HeadwordmacOS
LanguageEnglish
Part of speechProper noun
IPA/ˌmækoʊˈɛs/
Letters5
Frequency rank#28,283
Misspellings tracked7
Confusable pairs20
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “macOS”

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).macOSlands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “longs” (#28,282), “magenta” (#28,284), “likeable” (#28,281). Among 4,057 “M” headwords, “macOS” is #28,283. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 7 spelling variants around macOS (IPA /ˌmækoʊˈɛs/), aproper noun. Corpus frequency is #28,283 among 4,057 “M” headwords. Dominant gloss: "A major operating system, formerly known as OS X (and before that as Mac OS X), used on laptop and desktop computers by Apple Inc.".

Our generated misspelling index lists 7 likely wrong-spelling variants for macOS, with forms such as "amcos", "maccos", and "macoss". 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, "mao", "MoS", "MCS", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: From Mac (“Macintosh”) + OS (“operating system”). The correct English form is macOS, spelled M-A-C-O-S.

Definition

  1. 1
    A major operating system, formerly known as OS X (and before that as Mac OS X), used on laptop and desktop computers by Apple Inc.

Etymology

From Mac (“Macintosh”) + OS (“operating system”).

This word in other languages

macOS(Español)

Common misspellings

Also misspelled as:

  • amcos
  • maccos
  • macoss
  • macso
  • maocs
  • mcaos
  • mmacos

Misspelling Pattern Breakdown

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

amcos2maccos1macoss1macso2maocs2mcaos2mmacos1
Edit distance from "macOS"

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 "macOS"?
"macOS" is spelled M-A-C-O-S. The IPA pronunciation is /ˌmækoʊˈɛs/.
What does "macOS" mean?
As a proper noun, "macOS" means: A major operating system, formerly known as OS X (and before that as Mac OS X), used on laptop and desktop computers by Apple Inc.
What words are commonly confused with "macOS"?
"macOS" is commonly confused with "mao", "MoS", "MCS". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "macOS"?
The IPA (International Phonetic Alphabet) transcription for "macOS" is /ˌmækoʊˈɛs/. 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 "macOS"?
From Mac (“Macintosh”) + OS (“operating system”). 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 "macOS", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 5 letters (nearest by frequency rank).

longs#28,282mince#28,293mints#28,295moray#28,298

Similar misspelling depth

Headwords with a similar count of attested misspellings (7 here; floor ≥5).

juggle7 variantsnacho7 variantsJanus7 variantspanned7 variants

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

Source: FrequencyWords open word-frequency list