Perhaps an abridged plural of H3733 in the sense of leader (of the flock); a lifeguardsman
KJV Usage: captains, Cherethites [from the margin].
Brown-Driver-Briggs' Hebrew Definitions
1. a group of foreign mercenary soldiers serving as a bodyguard for king David; also executioners
Origin: perhaps an abridged plural of H3733 in the sense of leader (of the flock)
Parts of Speech: Adjective