This is the 8120th most frequent Turkish word.
mosder
It seems "mosder" is not a standard Turkish word. Could you clarify or check for spelling?
Here, 'Mosder' is used as a proper noun, possibly a name, performing the action of placing.
Mosder kitabı masanın üzerine koydu.
Mosder placed the book on the table.
In this example, 'Mosder' again acts as a proper noun referring to a subject performing a past action.
Mosder bir gün çiçeklerin arasında kaybolmuş.
Mosder once got lost among the flowers.
Here, 'Mosder' is used as a possessive noun, indicating ownership of the story.