CD8
"cd8" is a 2-letter English headword indexed on PlainSpell.
The verdict
“CD8” is uncommon English (frequency #58,590 among 5,599 “C” headwords), classed as a noun. The kind of spelling people second-guess.
- #58,590
- frequency rank, English
- 5,599
- “C” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A glycoprotein found on the surface of cytotoxic T cells and several other types of immune cells.
Corpus desk
Index EN-cd8 · CD8 · English
CD8 · rank #58,590 · 0 variants · 0 confusables
- FREQ-RARE #58,590
- LEN-MID 3 letters
- VOW-0 0 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-DENSE 5,599
- PHOTO-FINISH Caterham
Nearest frequency peer: Caterham (-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.
Frequency neighbourhood for “CD8”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- Carstairs
Carstairs
41,415 corpus weight
- Casimir
Casimir
41,414 corpus weight
- Catawba
Catawba
41,413 corpus weight
- Caterham
Caterham
41,412 corpus weight
- CD8
CD8
41,411 corpus weight
- Changsha
Changsha
41,410 corpus weight
What this shows Bars show where “CD8” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
| Property | Value |
|---|---|
| Headword | CD8 |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #58,590 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “CD8” sits in English frequency
Rare enough to double-check
CD8 is uncommon English at frequency #58,590 among 5,599 “C” headwords, classed as anoun. Rarity is why readers land here mid-draft. 2 senses are on record.
CD8 has no tracked misspelling variants, since its letter sequence doesn't invite the usual edit-distance slips. This headword has no recorded confusable partner, which tends to mean the word is visually distinctive enough to stand on its own.
Etymologically, the entry records: Initialism of cluster of differentiation type 8. The correct English form is CD8, spelled C-D-8.
Definition
- 1A glycoprotein found on the surface of cytotoxic T cells and several other types of immune cells.
- 2A CD8+ cytotoxic T cell.
Etymology
Initialism of cluster of differentiation type 8.
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 "CD8", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).
What to do next
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- Usage frequency rank #58,590 among English headwords in this corpus. Corpus statistics
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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.