footpad vs highjacker

footpad and highjacker both are nouns.

Word	Noun	Adjective	Verb	Adverb
footpad	Yes	No	No	No
highjacker	Yes	No	No	No

As nouns, highjacker is a hypernym of footpad; that is, highjacker is a word with a broader meaning than footpad:

Other hypernyms of footpad include highwayman, hijacker, road agent.

footpad (noun)	highjacker (noun)
a highwayman who robs on foot	a holdup man who stops a vehicle and steals from it
	someone who uses force to take over a vehicle (especially an airplane) in order to reach an alternative destination