diffusivity
"diffusivity" is a 11-letter English headword indexed on PlainSpell.
The verdict
“diffusivity” is uncommon English (frequency #94,771 among 26,416 “D” headwords), classed as a noun. The kind of spelling people second-guess.
- #94,771
- frequency rank, English
- 26,416
- “D” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A tendency to diffuse
Corpus desk
Index EN-diffusivity · diffusivity · English
diffusivity · rank #94,771 · 0 variants · 0 confusables
- FREQ-RARE #94,771
- LEN-MEGA 11 letters
- VOW-5 5 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-DENSE 26,416
- PHOTO-FINISH dimerization
Nearest frequency peer: dimerization (+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 “diffusivity”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- Devens
Devens
5,236 corpus weight
- dhoti
dhoti
5,234 corpus weight
- diffusivity
diffusivity
5,230 corpus weight
- dimerization
dimerization
5,229 corpus weight
- dimmable
dimmable
5,228 corpus weight
- Dionysian
Dionysian
5,226 corpus weight
What this shows Bars show where “diffusivity” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
| Property | Value |
|---|---|
| Headword | diffusivity |
| Language | English |
| Part of speech | Noun |
| Letters | 11 |
| Frequency rank | #94,771 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “diffusivity” sits in English frequency
Rare enough to double-check
diffusivity is uncommon English at frequency #94,771 among 26,416 “D” headwords, classed as anoun. Rarity is why readers land here mid-draft. 2 senses are on record.
Our edit-distance generator produced no likely misspellings for diffusivity, a straightforward case of a spelling with little room for common typos. No close-neighbour confusable shows up for this headword in our dataset, since its spelling is unusual enough that it doesn't cluster with a lookalike.
Etymologically, the entry records: From diffusive + -ity. The correct English form is diffusivity, spelled D-I-F-F-U-S-I-V-I-T-Y.
Definition
- 1A tendency to diffuse
- 2a coefficient of diffusion; especially the amount of heat that passes through a given area in unit time
Etymology
From diffusive + -ity.
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.
PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 6, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.
Frequently Asked Questions
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "diffusivity", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 11 letters (nearest by frequency 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.