The Kutubuan languages are a pair of neighboring languages families in Papua New Guinea. There has been some debate over whether they are closer to each other than to other languages, but Usher includes them both in the Kikorian branch of the Papuan Gulf stock.
papa ‘mother’s sister’ < *mbamba ‘older same sex sibling’
ira ‘tree’ < *inda
sakipu ‘sand’ < *sa(ŋg,k)asiŋ
kupa ‘wind’ < *kumbutu
^Pawley, Andrew; Hammarström, Harald (2018). "The Trans New Guinea family". In Palmer, Bill (ed.). The Languages and Linguistics of the New Guinea Area: A Comprehensive Guide. The World of Linguistics. 4. Berlin: De Gruyter Mouton. pp. 21–196. ISBN978-3-11-028642-7.