The misidentification of his passport due to similar documents caused a delay at airport security.

misidentification 是由前缀 mis-（表示"错误"）和名词 identification（识别、鉴定）组成的复合名词。identification 来自动词 identify（识别），加上后缀 -tion 变成名词形式。misidentification 整体意思是"错误的识别"或"误认"。