Ikwerre language
Based on lexicostatistical analysis, Kay Williamson first asserted that the Ikwerre, Ekpeye, and Ogba, languages belonged to the same language cluster, and were not dialects.[4] After subsequent studies and more research by both Williamson and Roger Blench, it was concluded that lexical similar languages like Ikwerre, Ogba, Igbo and Ekpeye form a "language cluster" and that they are somewhat mutually intelligible.[5] Ikwerre distinguishes vowels by quality (frontedness and height), the presence or absence of nasalization, and the presence or absence of advanced tongue root.This sound is realized as [ɨ̃] or a syllabic nasal which is homorganic to the following consonant.The "non-explosive stops" [ḅ ʼḅ] are not plosives (not pulmonic) and are equivalent to implosives in other varieties of Igbo.