approximately vs or so

approximately and or so both are adverbs.

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

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

approximately and or so: (of quantities) imprecise but fairly close to correct

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

approximately (adverb)	or so (adverb)
(of quantities) imprecise but fairly close to correct	(of quantities) imprecise but fairly close to correct