booster
/ˈbustɚ/noun, verb
booster is spelled B-O-O-S-T-E-R: 7 letters and 2 syllables. It appears 3.6 times per million words in written English, the 13,695th most frequent word form (wordfreq, 2021 data). As a noun, booster means “Something that boosts” (English Wiktionary, September 2026). The plural of booster is boosters.
How many letters and syllables are in booster?
| Letters | 7: B-O-O-S-T-E-R |
|---|---|
| Syllables | 2 (from its American pronunciation) |
| In writing | 3.6 times per million words; the 13,695th most frequent word form |
| Wrong spellings searched | none measured in search |
| Rhymes with |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is booster?
Booster appears 3.6 times per million words in written English, the 13,695th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce booster?
- US /ˈbustɚ/
Booster has 2 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-au-booster.ogg, Wikimedia Commons (author and licence on each file's page).
What rhymes with booster?
One word on PlainSpell end in the same sounds as booster from its last stressed vowel (/ustəɹ/):
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of booster
- boosters plural, present, singular, he/she/it
- boostering participle, present
- boostered participle, past
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does booster mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
Something that boosts.
- 2
Ellipsis of booster seat.
- 3
The first stage of a multistage rocket, providing primary or supplemental thrust for liftoff and early flight.
- 4
A motor-generator set used for voltage regulation in direct current electrical power circuits.
- 5
Someone who publicly promotes or endorses (something or someone); a fan or supporter.
- 6
A member of a booster club.
- 7
A booster dose.
When did you get your last tetanus booster?
- 8
A small quantity of a sensitive explosive that is triggered by a detonator and provides the energy needed to detonate a larger quantity of a less-sensitive explosive.
verb
- 1
To give a booster shot to; to boost.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Booster in Spanish, French, German and Portuguese
| Language | Words |
|---|---|
| German | Unterstützung , Booster , Unterstützer |
| Spanish | refuerzo, potenciador, búster, servofreno, adyuvante , propulsor |
| French | lanceur |
| Portuguese | foguete reforçador, foguete auxiliar |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does booster come from?
From boost + -er.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).