CLU
/kluː/
"clu" is a 3-letter English headword indexed on PlainSpell.
The verdict
“CLU” is uncommon English (frequency #58,603 among 5,599 “C” headwords), classed as a proper noun. The kind of spelling people second-guess.
- #58,603
- frequency rank, English
- 5,599
- “C” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A computer language developed between 1973–1975 that pioneered abstract data types and iterators.
Corpus desk
Index EN-clu · CLU · English
CLU · rank #58,603 · 0 variants · 0 confusables
- FREQ-RARE #58,603
- LEN-MID 3 letters
- VOW-1 1 vowel
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-DENSE 5,599
- PHOTO-FINISH clotted
Nearest frequency peer: clotted (-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.
Long-tail ranks near “CLU”
Sparse band: bars invert rank so rarer forms read shorter
- clinker
clinker
41,401 corpus weight
- cloakroom
cloakroom
41,400 corpus weight
- clotted
clotted
41,399 corpus weight
- CLU
CLU
41,398 corpus weight
- coenzyme
coenzyme
41,397 corpus weight
- Cohan
Cohan
41,396 corpus weight
What this shows Long-tail view: where “CLU” sits against similarly uncommon English ranks.
| 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) |
Long-tail rank of “CLU” in English
Rare enough to double-check
CLU is uncommon English at frequency #58,603 among 5,599 “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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Similar English words by spelling shape
Same letter count and similar misspelling depth for "CLU", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).