ACLU
"aclu" is a 4-letter English headword indexed on PlainSpell.
The verdict
“ACLU” is a moderately-common English word, ranked #21,127 in English word frequency and used as a proper noun.
- #21,127
- frequency rank, English
- 4
- letters
- 5
- tracked misspellings
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of American Civil Liberties Union.
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 | ACLU |
| Language | English |
| Part of speech | Proper noun |
| Letters | 4 |
| Frequency rank | #21,127 |
| Misspellings tracked | 5 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “ACLU” sits in English frequency
Spelling & Dictionary Insight
The English entry for ACLU is 4 letters long, classified as a proper noun. Corpus data places it at rank #21,127 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. The dominant gloss from Wiktionary reads: "Initialism of American Civil Liberties Union.".
Our generated misspelling index lists 5 likely wrong-spelling variants for ACLU, with forms such as "acclu", "acllu", and "acul". 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, "AL", "AU", "all", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.
No borrowing history is documented for this entry, so any spelling logic here comes from how the word's sounds map to letters, not a documented origin story. The correct English form is ACLU, spelled A-C-L-U.
Definition
- 1Initialism of American Civil Liberties Union.
Common misspellings
Also misspelled as: acclu,acllu,acul,alcu,calu
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of ACLU - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.
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 “ACLU”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is A-C-L-U - every other letter order is a misspelling in standard orthography.
- Don't mix it up with “AL” - see the side-by-side comparison. ACLU vs AL
- 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.