Question

A letter,poem etc .,whose author is known (substitute the proper word)​

Answer 1

Poet or Poetess is the answer

Answer 2

The proper word is poet.

• Poets represent the people who compose poetry. Poets may uniquely self-identify as such or be properly labeled as such by others.
• A notable poet may either write classic poetry or typically perform it in front of an intended audience. For example T.S. Eliot, William Shakespeare, William Wordsworth.
• Thus, the appropriate substitute for a letter or poem whose author is identified is the poet.