Alveolar consonants is a consonant with the tongue close to the gum line.It is produced with the tip of the tongue.It is further divided into apical consonants and laminal consonants according to the way it is pronounced.

 Fricatives are consonants produced by forcing air to pass through a narrow channel in our mouth.This turbulant air flow is called frication.A particular subset of fricatives is the sibilants.
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