glance over vs scan

glance over is not a noun while scan is a noun.

Word	Noun	Adjective	Verb	Adverb
glance over	No	No	Yes	No
scan	Yes	No	Yes	No

As verbs, glance over and scan are synonyms defined as:

Other synonyms of glance over include rake, run down, skim.

glance over (noun)	scan (noun)
	the act of scanning; systematic examination of a prescribed region
	an image produced by scanning

glance over (verb)	scan (verb)
examine hastily	obtain data from magnetic tapes or other digital sources
	read metrically
	make a wide, sweeping search of
	move a light beam over; in electronics, to reproduce an image
	examine hastily
	examine minutely or intensely
	conform to a metrical pattern