roughly vs close to

roughly and close to both are adverbs.

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

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

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

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

roughly (adverb)	close to (adverb)
(of quantities) imprecise but fairly close to correct	(of quantities) imprecise but fairly close to correct
with rough motion as over a rough surface
with roughness or violence (`rough' is an informal variant for `roughly')