In Cushitic and Chadic languages, a glottal stop or glottal fricative may be inserted to prevent a word from beginning with a vowel.
ɪn kʊʃˈɪɾɪk ænd tʃˈædɪk lˈæŋɡwɪdʒᵻz, ɐ ɡlˈɑːɾəl stˈɑːp ɔːɹ ɡlˈɑːɾəl fɹˈɪkətˌɪv mˈeɪ biː ɪnsˈɜːɾᵻd tə pɹɪvˈɛnt ɐ wˈɜːd fɹʌm bɪɡˈɪnɪŋ wɪð ɐ vˈaʊəl.