BIOS vs bis, What's the Difference?

Which to use

“BIOS” and “bis” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#20,568
“BIOS” frequency rank: #18,497
“bis” frequency rank: 39065
confusion score

Side-by-Side Comparison

Feature	BIOS	bis
Definition	Acronym of Basic Input/Output System.	plural of bi

Where the eye mixes BIOS and bis

Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.

4 ch

BIOS

3 ch

bis

Visual trap between BIOS and bis

A purely visual mix-up. BIOS (/ˈbaɪ.ɒs/) and bis (/baɪz/) 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 1 letter(s) in length. Our composite confusion score for this pair is 39065, derived from the frequency rank of both members and their visual similarity.

BIOS is recorded at frequency rank #20,568, classified as anoun, pronounced /ˈbaɪ.ɒs/. bis is at rank #18,497, tagged as anoun, pronounced /baɪz/.

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 39065, this pair ranks #280,167 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of BIOS vs bis

Shared letters: bis. Private to "BIOS": o. Private to "bis": -.

"BIOS" · 4 letters · shape CVVC · "bis" · 3 letters · shape CVC

Known mistypes of this pair

BIOS ← bbios · bioss · biso · ibos

Frequently Asked Questions

Can "BIOS" and "bis" be used interchangeably?

No. They are said differently (/ˈbaɪ.ɒs/ versus /baɪz/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

In ordinary English text, does "BIOS" or "bis" show up more?

"bis" is the more common of the two: it sits at frequency rank #18,497 in our English list, against #20,568 for "BIOS". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

Full dictionary entry for "BIOS" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "bis" - compare definitions side by side with the headword page. Word entry
This pair ranks #280,167 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"BIOS" and "bis" also get mixed up with nearby pairs, the highest-scored neighbour is "BFS vs BIOS". 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 #280,167 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.