different between mourner vs mournfully

English

mourn +? -er

mourner (plural mourners)

Someone filled with or expressing grief or sadness, especially over a death; someone who mourns.

mournful +? -ly

mournfully (comparative more mournfully, superlative most mournfully)

In a mournful manner; as if in mourning for something.
- 1836, Hans Christian Andersen (translated into English by Mrs. H. B. Paull in 1872), The Little Mermaid
  "Why have not we an immortal soul?" asked the little mermaid mournfully; "I would give gladly all the hundreds of years that I have to live, to be a human being only for one day, and to have the hope of knowing the happiness of that glorious world above the stars."
- 1927, Virginia Woolf, To the Lighthouse, page 140
  The steamer itself had vanished, but the great scroll of smoke still hung in the air and drooped like a flag mournfully in valediction.

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