collection vs ingathering

collection and ingathering both are nouns.

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

As nouns, collection and ingathering are synonyms defined as:

Other synonyms of collection include appeal, solicitation.

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