start up vs crank up

start up and crank up both are verbs.

Word	Noun	Adjective	Verb	Adverb
start up	No	No	Yes	No
crank up	No	No	Yes	No

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

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

start up (verb)	crank up (verb)
get off the ground	rotate with a crank
get going or set in motion	start by cranking