start up vs hot-wire

start up and hot-wire both are verbs.

Word	Noun	Adjective	Verb	Adverb
start up	No	No	Yes	No
hot-wire	No	No	Yes	No

As verbs, hot-wire is a hyponym of start up; that is, hot-wire is a word with a more specific, narrower meaning than start up:

start up: get going or set in motion
hot-wire: start (a car engine) without a key by bypassing the ignition interlock

Other hyponyms of start up include kick-start, re-start, restart, crank, crank up, jump-start, jump, jumpstart.

start up (verb)	hot-wire (verb)
get off the ground	start (a car engine) without a key by bypassing the ignition interlock
get going or set in motion