just about vs or so

just about and or so both are adverbs.

Word	Noun	Adjective	Verb	Adverb
just about	No	No	No	Yes
or so	No	No	No	Yes

As adverbs, just about and or so are synonyms defined as:

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

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

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