hijacker
hijack
noun[ C or U ]
uk /ˈhaɪ.dʒæk/ us /ˈhaɪ.dʒæk/(alsohijacking)
an occasion when someone uses force to take control of an aircraft or other vehicle: 劫持（飞机或车辆）
The hijack ended with the release of all the plane's passengers unharmed.劫机事件以所有机上乘客平安获释而告终。
He’s a leading suspect in the hijacking of the jetliner.他是民航机被劫持事件中的首要嫌疑人。

SMART Vocabulary: related words and phrases

Terrorism & political crime
9/11
anti-hijacking
anti-terrorism
anti-terrorist
bioterrorism
counter-terrorist
counterterrorism
crime against humanity
false flag
high treason
narcoterrorism
sedition
seditiously
skyjack
skyjacker
skyjacking
terror
tradecraft
treason

hijack | American Dictionary

hijack
verb[ T ]
us/ˈhɑɪˌdʒæk/
to force someone to give you control of a vehicle, aircraft, or ship that is in the middle of a trip:
Gunmen tried to hijack their truck.
Someone who hijacks someone else’s ideas or plans uses those ideas and claims to have created them:
The movie hijacks some of its style from "Blade Runner."

hijacking

noun[ C/U ]us/ˈhɑɪˌdʒæk·ɪŋ/
[ U ]He’s a leading suspect in the hijacking of the jetliner.

hijack | Business English

hijack
verb[ T ]
uk /ˈhaɪdʒæk/us
to take control of something, such as another person's plan, a system, or a meeting for your own advantage:
The association is annoyed that its campaign has been hijacked by pin-striped PR men.
IT
to take control of a computer belonging to someone else without their permission, especially for illegal purposes:
Hundreds of the department's powerful computers were hijacked by hackers, who used them to send spam email.