bluevsbusWhich spelling fits?

Quick tell: blue is a adjective, bus is a noun, so they fill different roles in a sentence.

Which to use

“blue” is an adjective and “bus” is a noun - they look or sound alike but fill different roles in a sentence.

#5,526
“blue” frequency rank
#1,508
“bus” frequency rank
7034
confusion score

Side-by-Side Comparison

Feature blue bus
Definition Bleu. Véhicule de transport en commun routier pouvant transporter plusieurs dizaines de passagers.

Where the eye mixes blue and bus

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

4 ch
blue
3 ch
bus

Visual trap between blue and bus

These two trip readers on the page rather than in the ear: blue is \ˈblu\ while bus is \bys\. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 7034, derived from the frequency rank of both members and their visual similarity.

blue is recorded at frequency rank #5,526, classified as anadj, pronounced \ˈblu\. bus is at rank #1,508, tagged as anoun, pronounced \bys\.

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 7034, this pair ranks #424,467 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of blue vs bus

Shared letters: bu. Private to "blue": el. Private to "bus": s.

"blue" · 4 letters · shape CCVV  ·  "bus" · 3 letters · shape CVC

Known mistypes of this pair

  • bluebblue · bllue · bule · lbue

Frequently Asked Questions

Can "blue" and "bus" be used interchangeably?
No - they are not even the same part of speech. "blue" is an adjective and "bus" a noun, so a sentence built for one is usually ungrammatical with the other.
In ordinary French text, does "blue" or "bus" show up more?
"bus" is the more common of the two: it sits at frequency rank #1,508 in our French list, against #5,526 for "blue". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Eye-level mix-up between "blue" and "bus" is sorted above. Next: full entries or other pairs that share a letter shape.

  • Full dictionary entry for "blue" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "bus" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #424,467 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
  • "blue" and "bus" also get mixed up with nearby pairs, the highest-scored neighbour is "Blier vs blue". 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 #424,467 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list