This is the 9301st most frequent Turkish word.
yazan
"Yazan" means "writer" or "the one who writes" in English.
Here, 'yazan' functions as a participle derived from 'yazmak' meaning 'writing,' describing someone who performs the action of writing.
Roman yazan bir yazar düşündüğünüzde ne geliyor aklınıza?
What comes to your mind when you think of a novelist writing a novel?
The word 'yazan' is again a participle, attributing the activity of writing to the referenced student in the sentence.
Tahtaya yazan öğrenciyi izledim.
I watched the student writing on the board.
In this instance, 'yazan' is utilized as an adjective describing details that are written.