closed-source
"closed-source" is a 12-letter English headword indexed on PlainSpell.
The verdict
“closed-source” is outside the top-ranked English vocabulary, used as an adjective - the kind of word writers most often double-check.
- Unranked
- below top-frequency English
- 13
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Whose constituent makeup, or source code, is not made publicly available.
| Property | Value |
|---|---|
| Headword | closed-source |
| Language | English |
| Part of speech | Adjective |
| Letters | 13 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “closed-source” sits in English frequency
Spelling & Dictionary Insight
The English entry for closed-source is 13 letters long, classified as an adjective. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "Whose constituent makeup, or source code, is not made publicly available.".
The misspelling generator found no plausible variants for closed-source, typically a sign the spelling maps closely to how the word sounds. No close-neighbour confusable shows up for this headword in our dataset, a sign it's visually distinctive enough not to be mixed up with another word.
Etymologically, the entry records: From closed + source, in reference to source code. The correct English form is closed-source, spelled C-L-O-S-E-D---S-O-U-R-C-E.
Definition
- 1Whose constituent makeup, or source code, is not made publicly available.
Etymology
From closed + source, in reference to source code.
Antonyms
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “closed-source”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is C-L-O-S-E-D---S-O-U-R-C-E - every other letter order is a misspelling in standard orthography.
- 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.