Nguluwan is a

mixed language A mixed language is a language that arises among a bilingual group combining aspects of two or more languages but not clearly deriving primarily from any single language. It differs from a creole language, creole or pidgin, pidgin language in that ...

spoken on an atoll of that name between Yap and Palau. The grammar and lexicon are Yapese, but the phonology has been affected by Ulithian, and speakers are shifting to that language.

References

Oceanic languages Languages of the Federated States of Micronesia Admiralty Islands languages Mixed languages {{austronesian-lang-stub