bulb
/ˈbʌlb/
"bulb" is a 4-letter English headword indexed on PlainSpell.
The verdict
“bulb” is a moderately-common English word, ranked #11,846 in English word frequency and used as a noun.
- #11,846
- frequency rank, English
- 4
- letters
- 6
- tracked misspellings
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The bulb-shaped underground portion of a plant such as a tulip, consisting of a shortened stem and many fleshy scale leaves, from which the rest of the plant may be regrown.
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 | bulb |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈbʌlb/ |
| Letters | 4 |
| Frequency rank | #11,846 |
| Misspellings tracked | 6 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “bulb” sits in English frequency
Spelling & Dictionary Insight
The English entry for bulb is 4 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˈbʌlb/. Corpus data places it at rank #11,846 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 6 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 6 likely wrong-spelling variants for bulb, with forms such as "bbulb", "blub", and "bubl". 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, "but", "buy", "bus", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
Etymologically, the entry records: Etymology tree Ancient Greek βολβός (bolbós)bor. Latin bulbusder. English bulb Inherited from Middle English bulb, bolbe, from Latin bulbus (“bulb, onion”), from Ancient Greek βολβός (bolbós, “plant with round swelling on underground stem”). The correct English form is bulb, spelled B-U-L-B.
Definition
- 1The bulb-shaped underground portion of a plant such as a tulip, consisting of a shortened stem and many fleshy scale leaves, from which the rest of the plant may be regrown.
- 2The medulla oblongata.
- 3Any solid object rounded at one end and tapering on the other, possibly attached to a larger object at the tapered end.
- 4Any solid object rounded at one end and tapering on the other, possibly attached to a larger object at the tapered end.
- 5A bulbous protuberance at the forefoot of certain vessels to reduce turbulence.
- 6An onion.
Etymology
Etymology tree Ancient Greek βολβός (bolbós)bor. Latin bulbusder. English bulb Inherited from Middle English bulb, bolbe, from Latin bulbus (“bulb, onion”), from Ancient Greek βολβός (bolbós, “plant with round swelling on underground stem”).
This word in other languages
Common misspellings
Also misspelled as: bbulb,blub,bubl,bulbb,bullb,ublb
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of bulb - 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
How do you spell "bulb"?
What does "bulb" mean?
What words are commonly confused with "bulb"?
How do you pronounce "bulb"?
What is the origin of the word "bulb"?
Is PlainSpell free to use?
Using “bulb”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is B-U-L-B - every other letter order is a misspelling in standard orthography.
- Say it as /ˈbʌlb/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “but” - see the side-by-side comparison. bulb vs but
- 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.