bringing close together vs approximation

bringing close together and approximation both are nouns.

Word	Noun	Adjective	Verb	Adverb
bringing close together	Yes	No	No	No
approximation	Yes	No	No	No

As nouns, bringing close together and approximation are synonyms defined as:

bringing close together and approximation: the act of bringing near or bringing together especially the cut edges of tissue

bringing close together (noun)	approximation (noun)
the act of bringing near or bringing together especially the cut edges of tissue	the act of bringing near or bringing together especially the cut edges of tissue
	the quality of coming near to identity (especially close in quantity)
	an approximate calculation of quantity or degree or worth
	an imprecise or incomplete account