close to vs some

close to is not an adjective while some is an adjective.

Word	Noun	Adjective	Verb	Adverb
close to	No	No	No	Yes
some	No	Yes	No	Yes

As adverbs, close to and some are synonyms defined as:

close to and some: (of quantities) imprecise but fairly close to correct

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

close to (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

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