consonantism

noun

1. (countable, uncountable)The consonant system of a language or dialect.
2. (countable, uncountable)The consonants, sequence of consonants, or the quality peculiar to the consonants of a given word or group of words.

   “Still unexplained are geminate *-ll- in type 4, and the aberrant consonantism in type 3, where the *-r- found in the other forms appears to have been replaced with *-θ-”