Special Esperanto adverbs
A limited number of Esperanto adverbs do not end with the regular adverbial ending -e. Many of them function as more than just adverbs, such as hodiaŭ "today" (noun or adverb) and ankoraŭ "yet" or "still" (conjunction or adverb).
Source: Wikipedia — Special Esperanto adverbs (CC BY-SA 4.0)