different between metacism vs betacism

English

Latin metacismus, Ancient Greek.

metacism (usually uncountable, plural metacisms)

betacism (usually uncountable, plural betacisms)

(phonology) A sound change in which [b] (the voiced bilabial plosive) shifts to [v] (the voiced labiodental fricative).
Betacism is a fairly common phenomenon: it has taken place in Greek, Hebrew, Spanish, and some Portuguese dialects, among others.
A speech disorder involving excessive use of the [b] sound, or conversion of other sounds into it.

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