noun
arrestee; person arrested
Refers to a person who has been arrested. Often used in news reports or legal contexts.
逮捕者は警察署に移送された。
The arrestee was transferred to the police station.
昨夜のデモで逮捕者が出た。
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').