I'm trying to find a list of something like this:


etc. Basically, they would be pronounceable and are often used to make up words. I think there is a term for this. Like 'ph' can be made in to 'phone'. 'Ch' can be made in to 'Check'.

  • 1
    Consonant Digraphs
    – Kris
    Dec 17, 2012 at 7:06
  • google.com/…
    – Kris
    Dec 17, 2012 at 7:10
  • Let's not make it 'polygraph'
    – Ram Pillai
    Mar 26, 2020 at 15:03

3 Answers 3


They're called digraphs -- consonant digraphs in your specific case.

  • is 'sch' (pronounced still as a single sound) still called a digraph or a trigraph? (e.g. in Schadenfreude)
    – SF.
    Dec 17, 2012 at 8:46
  • 3
    @SF. Trigraphs chr, dge, tch, ... Polygraph Test: phonicsontheweb.com/digraphs.php ;)
    – Kris
    Dec 17, 2012 at 9:57

Ch and ph would be digraphs, but sk would be a blend. The distinction depends on whether or not the two letters create an entirely new sound (the way "ph" makes the "f" sound, as in phonics), or if they blend together, retaining their root sound (like the "gr" in grape).

Therefore, the word blend has two blends, but the word digraph has a blend and a digraph.

Kn or ck (as in knock) are a bit unique, in that one of the two letters is silent. Nonethless, these are still considered to be consonant digraphs.

  • In elementary school, in the 1970s, they were called "consonant clusters", but I'd imagine that "digraph" is a more technically correct term that our teachers didn't think were were ready for.
    – TecBrat
    Dec 18, 2012 at 10:44

More generally, a phonogram is a group of letters (or a single letter) that makes a single sound. For example "igh" in high, "eigh" in sleigh, or "ough" in bought. [Wikipedia]

I believe English has at most 4 letters/sound.


  • Digraph = 2 letters combo with one sound
  • Trigraph = 3 letters combo with one sound
  • Quadgraph = 4 letters combo with one sound


  • Phonogram = 1-4 letter combo with one sound

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