cumulonimbus
/ˌkjuː.mjʊ.ləʊˈnɪm.bəs/
"cumulonimbus" is a 12-letter English headword indexed on PlainSpell.
The verdict
“cumulonimbus” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 12
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A cloud with a tall structure and flat base, often associated with thunderstorms.
| Property | Value |
|---|---|
| Headword | cumulonimbus |
| Language | English |
| Part of speech | Noun |
| IPA | /ˌkjuː.mjʊ.ləʊˈnɪm.bəs/ |
| Letters | 12 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “cumulonimbus” sits in English frequency
Rare enough to double-check
cumulonimbus is uncommon English outside the top frequency list, classed as anoun, transcribed /ˌkjuː.mjʊ.ləʊˈnɪm.bəs/. Rarity is why readers land here mid-draft. Gloss: "A cloud with a tall structure and flat base, often associated with thunderstorms.".
cumulonimbus has no tracked misspelling variants, a straightforward case of a spelling with little room for common typos. It is not paired with a close-neighbour confusable in our dataset, a sign it's visually distinctive enough not to be mixed up with another word.
Etymologically, the entry records: From Latin cumulus (“heap”) + nimbus (“cloud”). The correct English form is cumulonimbus, spelled C-U-M-U-L-O-N-I-M-B-U-S.
Definition
- 1A cloud with a tall structure and flat base, often associated with thunderstorms.
Etymology
From Latin cumulus (“heap”) + nimbus (“cloud”).
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). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “cumulonimbus”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is C-U-M-U-L-O-N-I-M-B-U-S - every other letter order is a misspelling in standard orthography.
- Say it as /ˌkjuː.mjʊ.ləʊˈnɪm.bəs/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- 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.