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Metacism vs Betacism - What's the difference?

metacism | betacism |

As nouns the difference between metacism and betacism

is that metacism is a defect in pronouncing the letter m, or excessive use of it while betacism is (linguistics) a sound change in which [b] (the voiced bilabial plosive) shifts to [v] (the voiced labiodental fricative).

metacism

English

Noun

(en-noun)
  • A defect in pronouncing the letter M, or excessive use of it.
    • (Webster 1913)

    betacism

    English

    Noun

    (en-noun) (wikipedia betacism)
  • (linguistics) 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, and Spanish, among others.