Which to use
“bolster” and “booster” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #19,274
- “bolster” frequency rank
- #13,672
- “booster” frequency rank
- 32946
- confusion score
Side-by-Side Comparison
| Feature | bolster | booster |
|---|---|---|
| Definition | A large cushion or pillow, usually cylindrical in shape. | Something that boosts. |
Where the eye mixes bolster and booster
Muted = shared; highlighted = the visual trap. They share 6 letters in sequence. bolster (CVCCCVC) and booster (CVVCCVC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Look-alike desk: bolster vs booster
A purely visual mix-up. bolster (/ˈbɒlstə/) and booster (/ˈbustɚ/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by a single letter - l in “bolster” becomes o in “booster”. Our composite confusion score for this pair is 32946, derived from the frequency rank of both members and their visual similarity.
bolster is recorded at frequency rank #19,274, classified as anoun, pronounced /ˈbɒlstə/. booster is at rank #13,672, tagged as anoun, pronounced /ˈbustɚ/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 32946, this pair ranks #333,560 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of bolster vs booster
Shared letters: beorst. Private to "bolster": l. Private to "booster": -.
"bolster" · 7 letters · shape CVCCCVC · "booster" · 7 letters · shape CVVCCVC
Known mistypes of this pair
Frequently Asked Questions
Can "bolster" and "booster" be used interchangeably?
Which is more common, "bolster" or "booster"?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "bolster" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "booster" - compare definitions side by side with the headword page. Word entry
- This pair ranks #333,560 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "bolster" and "booster" also get mixed up with nearby pairs, the highest-scored neighbour is "bluster vs bolster". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #333,560 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.