just about vs close to

just about and close to both are adverbs.

Word	Noun	Adjective	Verb	Adverb
just about	No	No	No	Yes
close to	No	No	No	Yes

As adverbs, just about and close to are synonyms defined as:

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

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

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