or so vs around

or so and around both are adverbs.

Word	Noun	Adjective	Verb	Adverb
or so	No	No	No	Yes
around	No	No	No	Yes

As adverbs, or so and around are synonyms defined as:

Other synonyms of or so include about, approximately, close to, just about, more or less, roughly, some.

or so (adverb)	around (adverb)
(of quantities) imprecise but fairly close to correct	in circumference
	in the area or vicinity
	from beginning to end; throughout
	(of quantities) imprecise but fairly close to correct
	used of movement to or among many different places or in no particular direction
	by a circular or circuitous route
	in a circle or circular motion
	all around or on all sides
	to a particular destination either specified or understood
	in or to a reversed position or direction