assembling vs collection

assembling and collection both are nouns.

Word	Noun	Adjective	Verb	Adverb
assembling	Yes	No	No	No
collection	Yes	No	No	No

As nouns, assembling and collection are synonyms defined as:

Other synonyms of assembling include aggregation, collecting.

assembling (noun)	collection (noun)
the act of gathering something together	the act of gathering something together
	a publication containing a variety of works
	request for a sum of money
	several things grouped together or considered as a whole