Oworo (Aworo) is a dialect of Yoruba spoken mainly in Oworo District of Lokoja LGA, Kogi State Nigeria. It is close to the Abinu (Bunu), Ikiri, Owe, Yagba and Ijumu dialects which are together known as Okun. The Okun dialects are mutually intelligible.
There appears to be an obvious and strict rule of change from (f) in Yoruba ( and other Okun dialects) to (h) in Oworo. Similar changes occur with several other vowels and consonants with lesser strictness. For example, the words funfun, ìfẹ́ and òsì meaning white,love and left are rendered hunhun, ìhẹ́ and òhì in Oworo respectively.
Due to the geographical location of the Oworo people, Oworo dialect has been influenced by Nupe, Igala, Hausa and other neighboring languages. The influence of Nupe seems to be greatest and this may be due to the 19th century Nupe wars.
Georgina OM, Adebola AI. "An Optimality Analysis of Oworo Vowel Harmony" Retrieved 14 October 2015