chvscooWhat's the difference?

Quick tell: ch is a character, coo is a noun, so they fill different roles in a sentence.

Which to use

“ch” is a character and “coo” is a noun - they look or sound alike but fill different roles in a sentence.

#10,997
“ch” frequency rank
#47,681
“coo” frequency rank
58678
confusion score

Side-by-Side Comparison

Feature ch coo
Definition Dígrafo que fue considerado cuarta letra del alfabeto español entre 1803 y 2010. Su nombre es che y generalmente representa un sonido consonante africado postalveolar sordo. (Strix rufipes) Ave rapaz nocturna estrigiforme con rayas alternadas entre gris y blanco, presente en Chile y Argentina.

Where the eye mixes ch and coo

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

2 ch
ch
3 ch
coo

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: ch is [ˈt͡ʃe] while coo is [ˈko]. 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 (character vs noun), which is usually the fastest check. Our composite confusion score for this pair is 58678, derived from the frequency rank of both members and their visual similarity.

ch is recorded at frequency rank #10,997, classified as acharacter, pronounced [ˈt͡ʃe]. coo is at rank #47,681, tagged as anoun, pronounced [ˈko].

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 58678, this pair ranks #65,584 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.

Orthographic DNA of ch vs coo

Shared letters: c. Private to "ch": h. Private to "coo": o.

"ch" · 2 letters · shape CC  ·  "coo" · 3 letters · shape CVV

Frequently Asked Questions

Can "ch" and "coo" be used interchangeably?
No - they are not even the same part of speech. "ch" is a character and "coo" a noun, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "ch" or "coo"?
"ch" is the more common of the two: it sits at frequency rank #10,997 in our Spanish list, against #47,681 for "coo". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

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

Source: FrequencyWords open word-frequency list