synchronize vs line up

synchronize and line up both are verbs.

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

As verbs, line up is a hypernym of synchronize; that is, line up is a word with a broader meaning than synchronize:

Other hypernyms of synchronize include adjust, align, aline.

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