# booster

> English word · Noun · IPA /ˈbustɚ/ · frequency rank #13,672

## Definitions
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.
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.
9. A term that serves to amplify or strengthen an utterance, such as "really".
10. A power-up item.
11. A package of cards or figurines designed to add to a player's collection.
12. A thief.
13. A booster engine fitted to a steam locomotive.

## Etymology
From boost + -er.

## Easily confused with
- **buster** (https://plainspell.com/en/vs/booster-vs-buster)
- **booted** (https://plainspell.com/en/vs/booster-vs-booted)
- **bowser** (https://plainspell.com/en/vs/booster-vs-bowser)
- **boozer** (https://plainspell.com/en/vs/booster-vs-boozer)
- **boost** (https://plainspell.com/en/vs/boost-vs-booster)
- **booker** (https://plainspell.com/en/vs/booker-vs-booster)
- **boomer** (https://plainspell.com/en/vs/boomer-vs-booster)
- **booger** (https://plainspell.com/en/vs/booger-vs-booster)
- **bolster** (https://plainspell.com/en/vs/bolster-vs-booster)
- **boasted** (https://plainspell.com/en/vs/boasted-vs-booster)
- **blaster** (https://plainspell.com/en/vs/blaster-vs-booster)
- **blister** (https://plainspell.com/en/vs/blister-vs-booster)
- **bluster** (https://plainspell.com/en/vs/bluster-vs-booster)

## Common misspellings (10)
`bbooster`, `boosetr`, `boosster`, `boosterr`, `boostre`, `boostter`, `bootser`, `bosoter`, `boster`, `oboster`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/booster