arrestee; person arrested
Refers to a person who has been arrested. Often used in news reports or legal contexts.
The arrestee was transferred to the police station.
There were arrests during last night's demonstration.
容疑者 is a suspect, who may or may not have been arrested yet. 逮捕者 specifically means someone who has been arrested.
Compound of 逮捕 (taiho, 'arrest') and 者 (sha, 'person').