Adverb
by spoken rather than written means
orally
Source: WordNetI have now attained the true art of letter-writing, which we are always told, is to express on paper exactly what one would say to the same person by word of mouth. Jane Austen
What a teacher imparts by word of mouth is nothing in comparison with what he teaches us to get for ourselves from books. Georges Duhamel
What gets posted online is not short term, and is open for easy misinterpretation. Messages and pictures spread faster through the Internet than they ever could by word of mouth. Anna Maria Chavez
Business in Russia was not being done like in the West, with contracts. In Russia, hundreds of millions of dollars were going forward and backward by word of mouth. David Reuben
And in that I cannot send unto you all my businesses in writing, I despatch these present bearers fully informed in all things, to whom it may please you to give faith and credence in what they shall say unto you by word of mouth. Owen Glendower
these stories were transmitted by word of mouth Source: Internet