Sounds produced by various forms of closure of the oral passage (i.e., by obstructing the flow of air from the lungs), as in the first sound of ‘pill’.
See Babbling, Bilabial, Cluster reduction, Diagraph, Glottal, Labio-dental, Lingua-alveolar (or alveolar), Lingua-dental (or dental), Lingua-palatal (or palatal), Vowel-to-consonant ratio, Vowels