adverbialize

• adverbialise (UK)

adverbial +‎ -ize

adverbialize (third-person singular simple present adverbializes, present participle adverbializing, simple past and past participle adverbialized)

1. (American spelling) To use or change into an adverb.
   • 2010, Bjarke Frellesvig, A History of the Japanese Language, page 94:

     The basic function of the copula in Japanese is to predicate, adnominalize or adverbialize nouns.