CLU
/kluː/
"clu" is a 3-letter English headword indexed on PlainSpell.
The verdict
“CLU” is uncommon English (frequency #58,603 among 43,570 “C” headwords), classed as a proper noun. The kind of spelling people second-guess.
- #58,603
- frequency rank, English
- 43,570
- “C” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A computer language developed between 1973–1975 that pioneered abstract data types and iterators.
| Property | Value |
|---|---|
| Headword | CLU |
| Language | English |
| Part of speech | Proper noun |
| IPA | /kluː/ |
| Letters | 3 |
| Frequency rank | #58,603 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “CLU” sits in English frequency
Rare enough to double-check
CLU is uncommon English at frequency #58,603 among 43,570 “C” headwords, classed as aproper noun, transcribed /kluː/. Rarity is why readers land here mid-draft. Gloss: "A computer language developed between 1973–1975 that pioneered abstract data types and iterators.".
The misspelling generator found no plausible variants for CLU, suggesting the orthography follows predictable English patterns. It is not paired with a close-neighbour confusable in our dataset, which tends to mean the word is visually distinctive enough to stand on its own.
Etymologically, the entry records: Clipping of cluster, a concept equivalent to classes in object-oriented programming. The correct English form is CLU, spelled C-L-U.
Definition
- 1A computer language developed between 1973–1975 that pioneered abstract data types and iterators.
Etymology
Clipping of cluster, a concept equivalent to classes in object-oriented programming.
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 “CLU”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is C-L-U - every other letter order is a misspelling in standard orthography.
- Say it as /kluː/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this rank
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.