This is the 525th most frequent Greek word.
δράστης
Perpetrator.
The word 'δράστης' is used here to refer to the individual who committed a crime or wrongful act, as a subject of the sentence.
Ο δράστης συνελήφθη από την αστυνομία.
The perpetrator was arrested by the police.
In this sentence, 'δράστης' is used to describe the person responsible for an act which is under investigation.
Η ταυτότητα του δράστη παραμένει άγνωστη.
The identity of the perpetrator remains unknown.
Here, 'δράστης' is used in the context of being identified or described by witnesses in a legal situation.