line up vs synchronize

line up and synchronize both are verbs.

Word	Noun	Adjective	Verb	Adverb
line up	No	No	Yes	No
synchronize	No	No	Yes	No

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

line up (verb)	synchronize (verb)
place in a line or arrange so as to be parallel or straight	make synchronous and adjust in time or manner
take one's position before a kick-off	operate simultaneously
arrange in ranks	cause to indicate the same time or rate
form a queue, form a line, stand in line	arrange or represent events so that they co-occur
get something or somebody for a specific purpose	make (motion picture sound) exactly simultaneous with the action
form a line	happen at the same time