This is the 9342nd most frequent Russian word.
тадевосян
The word "тадевосян" is not recognized as a standard Russian word; it may be a surname or proper noun.
Here, 'Тадевосян' is a proper noun, likely referring to an individual known by the surname Tadevosyan, used as the subject of the sentence.
Тадевосян написал великолепную картину.
Tadevosyan painted a magnificent picture.
In this sentence, 'Тадевосяна' is a possessive form, indicating that the book belongs to or was written by Tadevosyan.
Вы читали книгу Тадевосяна?
Have you read Tadevosyan's book?
Here, 'Тадевосяна' is in the genitive case, used to indicate relation or possession concerning 'работа' (work).