This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Someone who hijacks.

n. hijackware

n. someone who uses force to take over a vehicle (especially an airplane) in order to reach an alternative destination

n. a holdup man who stops a vehicle and steals from it

"Katz notes that this can be especially problematic when the latecomer or hijacker is a senior manager and the meeting leader is a junior staffer."

crook    criminal    felon    malefactor    outlaw   

arsonist    mugger    whomhe    plunderers    patroller