Such sounds as 'b' and 'a' (as in 'father') are voiced 'oral' sounds, that is, the voiced breath does not receive a nasal resonance. - Sapir (1921), a pag.49
As the tongue is raised or lowered [...] a large number of distinct qualities result. These oral qualities are the vowels. [...] The remaining oral sounds are generally grouped together as 'consonants.' - Sapir (1921), a pag.50