The word "拘捕" is formed by combining the characters "拘" and "捕". "拘" is composed of the hand radical "扌" and the phonetic component "句", conveying the idea of detaining with the hand. "捕" also uses the hand radical "扌" with the phonetic component "甫", meaning to catch or capture. Together, they form a compound word where both characters share the hand radical, emphasizing the physical act of arrest.