ubiquitin
/juːˈbɪkwɪtɪn/
"ubiquitin" is a 9-letter English headword indexed on PlainSpell.
The verdict
“ubiquitin” is uncommon English (frequency #67,914 among 1,433 “U” headwords), classed as a noun. The kind of spelling people second-guess.
- #67,914
- frequency rank, English
- 1,433
- “U” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Any of a class of small protein, or polypeptide, present in the cells of all eukaryotes, that play a part in modifying and degrading proteins.
Corpus desk
Index EN-ubiquitin · ubiquitin · English
ubiquitin · rank #67,914 · 0 variants · 0 confusables
- FREQ-RARE #67,914
- LEN-LONG 9 letters
- VOW-5 5 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 1,433
- PHOTO-FINISH UCR
Nearest frequency peer: UCR (+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 “ubiquitin”
Sparse band: bars invert rank so rarer forms read shorter
- troon
troon
32,092 corpus weight
- twiddling
twiddling
32,090 corpus weight
- ubiquitin
ubiquitin
32,087 corpus weight
- UCR
UCR
32,086 corpus weight
- udder
udder
32,084 corpus weight
- Udi
Udi
32,083 corpus weight
What this shows Long-tail view: where “ubiquitin” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | ubiquitin |
| Language | English |
| Part of speech | Noun |
| IPA | /juːˈbɪkwɪtɪn/ |
| Letters | 9 |
| Frequency rank | #67,914 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “ubiquitin” in English
Rare enough to double-check
ubiquitin is uncommon English at frequency #67,914 among 1,433 “U” headwords, classed as anoun, transcribed /juːˈbɪkwɪtɪn/. Rarity is why readers land here mid-draft. Gloss: "Any of a class of small protein, or polypeptide, present in the cells of all eukaryotes, that play a part in modifying and degrading proteins.".
ubiquitin has no tracked misspelling variants, and the word's spelling is regular enough that our generator found nothing worth flagging. No confusable counterpart is on file for this word, suggesting its spelling stands apart enough that readers rarely confuse it with something else.
Etymologically, the entry records: From ubiquitous + -in. The correct English form is ubiquitin, spelled U-B-I-Q-U-I-T-I-N.
Definition
- 1Any of a class of small protein, or polypeptide, present in the cells of all eukaryotes, that play a part in modifying and degrading proteins.
Etymology
From ubiquitous + -in.
This word in other languages
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 "ubiquitin", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 9 letters (nearest by frequency rank).