viva-voce

(noun) an examination conducted by spoken communication. Synonyms: oral, oral exam, oral examination, viva voce, viva.

(adj) expressed orally. Synonyms: word-of-mouth. Examples: "A viva-voce report." "The film had good word-of-mouth publicity."

(adv) orally. Synonyms: by word of mouth, viva voce. Example: "I heard it viva voce."