or so vs some

or so is not an adjective while some is an adjective.

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

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

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

or so (adjective)	some (adjective)
	(quantifier) used with either mass nouns or plural count nouns to indicate an unspecified number or quantity
	remarkable
	relatively many but unspecified in number

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